Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe71ccd533e8297…

MALICIOUS

PDF

80.7 KB Created: 2021-04-27 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1670f45794370ac7c650fcb81edab028 SHA-1: 0a82d069bc7de3076042a94aa76b40057c984748 SHA-256: 7fe71ccd533e8297a2ed6aed2a707b2bbd7efd2b18161f63a7b36e8c2aaf9725
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, hinting at its generation method rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=rebecca+by+daphne+du+maurier+analysis PDF link annotation
    • https://cdn.sqhk.co/gavezexu/fhgghoj/61387802464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_60111bea94fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_606c86b5e058c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fe5280d606b9.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/QZChfpz/23184058756.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/iavKjiN/ready_maker_assets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fd1910601434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_600f5f686a9f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401994/normal_5ff9a7e830bb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5ff0647add9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_6016ae3cec537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fdda4308aee2.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/7541b620-034b-452b-bfdb-ed795b7be652/86875311070.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_f49eceaf1dc3495bafeea9f7dfc90a2c.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_00c68e2d426e42f2ab06bfba1512384f.pdf?index=trueIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_144590b8f3704cf480dfb551596ebe39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1bfb30-b4bd-4c6c-86ea-712e4b5bcd37/eth_cepher_bible_review.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_2ad0a38b2d82422284525068ecf5c673.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd24ce9e-0b83-4b39-a8c2-807cc86c70c7/zezoguwoposerujutek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a7bb8c-9454-40d8-bbcd-6a2f5d8a1924/99973174617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2380cd2-6d53-481d-856e-0f20a4de998a/future_of_us_healthcare_industry.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_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 5560 bytes
SHA-256: 9e2d9c18d31aede64bdee20a0f7287cdf0b54055a83d157d48ea1cd926584537
font_01_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 10320 bytes
SHA-256: 39306969ffb706d290c4700de4d58d76b5616c290a7f2c264b19ac1211cf74ea

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