Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab0a2803d91c9c6…

MALICIOUS

PDF

69.2 KB Created: 2021-05-19 08:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f8729465563c45292128a9d6ba7b26b SHA-1: 9c182dd389cf21284d32e3712baa14802b30815f SHA-256: 6ab0a2803d91c9c6f51ee0a3c8482ca2d35fb147ccb97c9417efbe9410bc94dd
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://jumiwimov.ru/strik?utm_term=anatomy+physiology+coloring+book+answer+key PDF link annotation
    • https://jumojebanofoz.weebly.com/uploads/1/3/5/3/135302369/jifuxawivow-mezefipaduv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_60608053a1b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_60374e80e212a.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/0a3d5b0d.pdfIn PDF document text
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/24468.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/nifebogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_602c80234bf9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_5fd91a5421161.pdfIn PDF document text
    • https://vumimexuderuwaz.weebly.com/uploads/1/3/1/8/131871863/8009e7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_6050e8d4307a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_605f7ff62be8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_60164a5fb3513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_6048ec319cf31.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/5955f45432.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/pamasixed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goneduzum/how_to_pair_samsung_sound_bar_to_shaw_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/mazibekekebezewiriwozate.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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 5732 bytes
SHA-256: 07f4b78d79a0fef9d93b8658d8b2f2115beda969f3f787011fa9727d0a07aaf6
font_01_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 9912 bytes
SHA-256: 69889a87fec18f055220edaac280256468f09f261acf2ef8a03522585682669c

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