Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e859a064a3e0a9…

MALICIOUS

PDF

71.3 KB Created: 2021-03-19 10:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 968af1e7800ddffd154ddae5ade857f1 SHA-1: 50c87043546a2512daa8c33e3c2efe879e3215c9 SHA-256: 75e859a064a3e0a9d6748d5eeef18fb2dd456d88f41ee9a0d464b15557d78791
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm or content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=reverent+wedding+films PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421627/normal_6032e77768e9d.pdfIn PDF document text
    • http://nukels.xyz/answerable_synonyms_and_antonymspyw4o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_602dce42a922d.pdfIn PDF document text
    • http://getbuiss.online/malayalam_movie_in_tamilrockers_hdnyviw.pdfIn PDF document text
    • http://1xbet-regi.site/compendio_apologetica_catolica3h8ps.pdfIn PDF document text
    • http://watercart.ru/pesatogesado7f354.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/62912278291.pdfIn PDF document text
    • http://cyberghost.store/47215258885pdnz0.pdfIn PDF document text
    • http://faceit.su/extenuating_circumstances_form_city_universitysijls.pdfIn PDF document text
    • http://kvrovk.xyz/vaxutoxojavevafaxixwnqn3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_b45b406653d94de6933f1a2306be5ab6.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_b7ecdbc8d1654e53857818c721b776e0.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_ada77f56c24f4fc4bf6c269106e84a5b.pdf?index=trueIn PDF document text
    • http://nononulavojiki.myartsonline.com/ragoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756a018e-3a5f-4914-87e2-453088ea44f0/is_cu_boulder_a_good_engineering_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bac216-ca7e-4ca7-ae4d-662a6eb8b16a/16073735145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d1077a-7a95-46e7-9b9e-63133415a784/7384942310.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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 5176 bytes
SHA-256: 2c099ccc764a68d2718d9ebcdb443b7bdc2888c6dcdd7afbbca983fb2bee52fa
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 11260 bytes
SHA-256: 3a09a45bd6c0733c8c707e90c966b86971874e80ad03a410109f386597ef14a3

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