Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c61dfaef6787d3…

MALICIOUS

PDF

105.1 KB Created: 2021-03-04 23:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c65cf26c5818d50049302c74bc3fa002 SHA-1: 1d5a86714273603096c51cb3f9617b663a516d0c SHA-256: c3c61dfaef6787d36eb2e3fb6e949ca50cee2bbe9ad6bb265d4317cfe6bf7674
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://jumiwimov.ru/strik?utm_term=d%2526d+castle+ravenloft+campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=d%2526d+castle+ravenloft+campaign PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368742/normal_601be30da3442.pdfIn PDF document text
    • https://lipodemofuxe.weebly.com/uploads/1/3/5/3/135316225/mijebora_renuzomavigew_fufijajuke.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/jafedomobag_bopove.pdfIn PDF document text
    • http://lg-copyrightforms.com/dominos_nutrition_info64ni3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5ffda35ce47f4.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/864a468129.pdfIn PDF document text
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/bazegeneb-xemudajuzifisa.pdfIn PDF document text
    • http://sellforce.ru/junkspace_rem_koolhaas1wcbe.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/pamosesubia4rx2.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/9181023.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/1747758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_600ff994ead59.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/1e114215d.pdfIn PDF document text
    • https://seguronudolag.weebly.com/uploads/1/3/4/4/134468074/bd42fec752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3219174-ad0c-4291-bf82-d1827ca90af9/pekikedel.pdfIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_5b6985f1cfef4b72b747b9ae8c8877ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ab9e10-240e-4e0b-a8cc-13148b4198cc/how_to_get_loan_processing_experience.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b435bfb4046246fe972a823f49d084e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eec230e-ae20-4555-91e2-686d00ca702d/the_seventh_most_important_thing_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74312a0-5ac8-4da3-abc6-0553881d4155/pathfinder_adventure_paths_ranked.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_0e3314ae9e3643ba99c59b26b219bed1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78dd81dd-0a79-4176-b802-fd419aabb416/el_censor_luisa_valenzuela.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000184b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x184B6 6504 bytes
SHA-256: f8ebae8ea2381a5f5a5db4f03c6c737f92a142e66c67ccbdc2f7fea2b5259cac
font_00_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 7516 bytes
SHA-256: 76f34301b0f0f3260df63e8e06ee417912ceebc1ec9b161224d906abd4afa021
font_01_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 3148 bytes
SHA-256: 3d18dca7e3151ab78b523ac4104e86b88c6789bd7feb2b9d7711bf9cdfa03466
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 4156 bytes
SHA-256: 4137e011fb50e940388b7a91a31e36f70741d8ce55ef6fbc7fb0314564e06879
font_03_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 6280 bytes
SHA-256: a3b179770175167fc105d601e782d97fe9fd5fdbff0be5084ea02020e73dba2c
font_04_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 18196 bytes
SHA-256: 8d5333938778a8664f8479ce688e82b1f3d7f285d3f26d30e5a74d37b4b2b212
font_05_sfnt_off00016e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E17 16516 bytes
SHA-256: f3bf7d65e83e0dc75c5df7c05093edf1192c13d377daee4cf108b80aa32c4637

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