Malicious PDF — malware analysis report

Static analysis result for SHA-256 805c6c9daac94b31…

MALICIOUS

PDF

80.2 KB Created: 2021-05-03 09:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5cef469487da8abed67bb05aa89941a5 SHA-1: eed05bc04f4e28587c7ae3bb890664d42add83ee SHA-256: 805c6c9daac94b31a71baf21d38ea426f60f9e9e2959110e19bdbd963ab6be50
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL identified is https://xezojetit.ru/strik?utm_term=how+to+a+healthy+relationship, which is likely part of a campaign to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

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://xezojetit.ru/strik?utm_term=how+to+a+healthy+relationship PDF link annotation
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/gagokapon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6041cc231c15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_6059c032b3c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_6032e42eb0d49.pdfIn PDF document text
    • http://aycotoro7.xyz/damn_delicious_sheet_pan_garlic_butter_salmonghemd.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/walupobarufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_600365552fb5f.pdfIn PDF document text
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/f32d1826d05.pdfIn PDF document text
    • https://ruzowevo.weebly.com/uploads/1/3/1/4/131453610/lelojerazedunu.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/zatedakemel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_606e37d8ec642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_60283213e6c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494136/normal_6002a70374217.pdfIn PDF document text
    • http://tojebaragokib.22web.org/curvature_in_cartesian_coordinates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_600664a799b19.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/8b3ffbd5-859e-418b-b352-8233ca5015e0/is_prodigy_membership_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33000bc6-8ca3-4681-8835-b3d8f639fa49/zetex.pdfIn PDF document text
    • http://marakolin.epizy.com/98545887880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e05864-36cd-4785-bc4b-48d138417aea/30560490889.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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 5064 bytes
SHA-256: 00f13b5bc1dc0cd94cbefdb8f7b02d64e866f627aa5c2b4f7e64f3c6db02ce76
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10832 bytes
SHA-256: c2ba39b4f45d30e4484e671f4ff537dbf9f8d18b4c1f62f0c3e2b7954b91852e

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