Malicious PDF — malware analysis report

Static analysis result for SHA-256 6641d6dbb9715537…

MALICIOUS

PDF

76.4 KB Created: 2021-04-28 10:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82b0b94d86f5d4f1be09daa5bf9058a0 SHA-1: e84b55a8c031d745884a3c8bf2a1705242baf190 SHA-256: 6641d6dbb9715537f47217382b3d36125522fa3b3e2c34ef26ba438b9b88d68e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://nipisod.ru/strik?utm_term=nanda+nursing+diagnosis+for+hypertension+in+pregnancy PDF link annotation
    • https://cdn.sqhk.co/zejegure/vf5Kij1/55133108175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5ff003a3f415e.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/uQibwZm/81908641185.pdfIn PDF document text
    • http://trokot-tonirovka.online/669730917485mf3e.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/eWPRlgg/human_resource_management_course_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_606936b5788c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_603b7819d419b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_605ee8e6e2458.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/id8gibD/tujaga.pdfIn PDF document text
    • http://instasurprise.online/11801368737ki8z0.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/ihkk0O5/dunudafuxejojefinezusu.pdfIn PDF document text
    • http://dektesheff.xyz/multilin_369_communications_guidew3dq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_4c9cfc7b0a034de597669cd8462a4ab4.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_a820b0643f0f4e2d9375d88767994a0c.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_a0ce130ddd3b40be8c85dd232e7b2fa2.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_44869a81ef144da098fa7a03a0bd138c.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_0f5ec90b66214094b921ef5122e5bf0e.pdf?index=trueIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_e9b2aaa00d104b60b4a2df6c9ea00035.pdf?index=trueIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_7c98c695960b4cb7b11d2f20a9ee53cb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5456 bytes
SHA-256: 0a28c2ad6c32d3bcb4693388e4509807a4b49ddd71c83ee66abc593b3907becd
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 11144 bytes
SHA-256: 5d4647680a5724a0268d98ba9e4ee65146e1a28a6c32ff38af984bc234af9da4

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