Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc96fd84cfab057a…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 08:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e87cf494ba9c6d67ca0dd93e96f0fd3 SHA-1: b4d13ea4bd7704993d85a32694e844976edac210 SHA-256: fc96fd84cfab057a7dbe22e6964d60d7b15a4a08743fb3d9c8d758ee6a5523fd
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=abbyy+pdf+transformer+12+serial+number PDF link annotation
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/gojilexumavibujedi.pdfIn PDF document text
    • https://lupirolawa.weebly.com/uploads/1/3/1/4/131453436/a3c6917485eb47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5fcd989003452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_6042fc5230dc9.pdfIn PDF document text
    • https://gomepenet.weebly.com/uploads/1/3/0/8/130874128/ac2af8d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407069/normal_5fd2aebf7d658.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/allopathic_medicine_list_and_uses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_605427d5bc439.pdfIn PDF document text
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/sugezonisiwimir_didaleluxajok_tesotuwoka.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/xebatexorewet.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/02e516d45ccc56a.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/interpreter_of_maladies_sparknotes_a_temporary_matter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_6011715551952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_60463459aa48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_60240d0582b32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_b922350137c64c3a9f12d8c5807883c8.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/50_shades_of_grey_darker_movie_full_movie_2018.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_c9b601045ee243c495e3a638acfb43a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5a16d0-90bb-476b-9b1e-828c3355dd6d/surezavukoxekiwapasip.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_86a7ff2173734b81a9a563543e7d149e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4c1e1f-c376-41d4-a521-1eacc3b39835/washington_examiner_free_app.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_896f0fa19cea44fab9e08bfc7cd8938f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a665875-486d-46a0-ab79-4af057a0d2e8/how_to_make_your_own_copy_and_paste_symbol.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 5604 bytes
SHA-256: 3157301eebe63140e1894904113d577359df0026c2455b8848d4d57c69240051
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10716 bytes
SHA-256: a20e5af0abf4b242c1bbec0050fb76bc3f4d246de2a577cda01a943a21bd820c