Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86c5961a3fd140e…

MALICIOUS

PDF

102.6 KB Created: 2021-05-12 08:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07536c07a079cad1e86f327176e32c1e SHA-1: 1aba82bfa901b5101ffe5664322057896670b3dd SHA-256: f86c5961a3fd140ef27ea7b1ce7b94fb5c40c9b3d3da0aae1f517053a8af0997
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=what+intermolecular+forces+are+present+between+methanol+and+bromine PDF link annotation
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/8722bc01a7434ae.pdfIn PDF document text
    • http://pasagotijaweti.iblogger.org/minecraft_hour_of_code_designer_answers.pdfIn PDF document text
    • https://nixitemolepof.weebly.com/uploads/1/3/4/8/134870129/7083275.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/70ae4483a70a62.pdfIn PDF document text
    • https://fibunijir.weebly.com/uploads/1/3/0/7/130740490/gotiweneb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzegez.epizy.com/zuvebaletusinu.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_e445a7e0e10e420995a32b6d16009699.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_a5999a002e134527a76c6cba0044bf4f.pdf?index=trueIn PDF document text
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_ab77f11089e344fca50f5201c8f1a1e5.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_da304d57826942fa8c2885110acc727e.pdf?index=trueIn PDF document text
    • http://nuxizutize.rf.gd/wovizapebiva.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_271d6d58695f416a85c09f867e447961.pdf?index=trueIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_3d1afa2a95af424598d77a8d4404b09a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/dreamweaver_photography_website_templates.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_b0e5d4d881b0493cbf037c4113e13831.pdf?index=trueIn PDF document text
    • http://gegenig.epizy.com/metformin_weight_loss_antipsychotic_induced_weight_gain.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_fa23afae7a4848519cc36c800e08a141.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/maplestory_class_guide_2019.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_f582a9fd85b14206927490caedafa746.pdf?index=trueIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 5640 bytes
SHA-256: 785ad94179be179d03664d850c5bff610ccfe1066606124a215da37b4533fc44
font_01_sfnt_off00014f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F13 11552 bytes
SHA-256: 545bbbad7aa85b40111f2732162e390ecbc08ec352b26736b71450542080a596
font_02_sfnt_off000176cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176CD 16260 bytes
SHA-256: 16d3f8655114d0902318f1a45715520560773d3bf5e390d74f207be828cb3ad7