Malicious PDF — malware analysis report

Static analysis result for SHA-256 94738ead6a20ec3d…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 11:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c3ef01b595d5a983a6c75b76bcbb08b8 SHA-1: 57f53c52defe2c2fe59f4cbf2f5af38e8a173494 SHA-256: 94738ead6a20ec3d29dc70af588cea699311825c093a227248a349283d0962fc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be related to a game lure, likely intended to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates 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://baarspo.ru/wix?keyword=stealin+home+game+unblocked PDF link annotation
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/4910937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412890/normal_5ff2bda8e9339.pdfIn PDF document text
    • https://pogerukafitili.weebly.com/uploads/1/3/1/4/131437037/rofiketuwesim_vunoxerufizi_badilejevu_makagizulilax.pdfIn PDF document text
    • http://natur-bio.space/66448829712ywryf.pdfIn PDF document text
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/c97207c5578b707.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/vixutisexazale.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/57723a722e.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/43240ee26c805a.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/dujozivon.pdfIn PDF document text
    • http://blankid.ru/44622534513xhwws.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/jibopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5fde7fcb2d670.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/8730193.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/wulutixedo.pdfIn PDF document text
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/bigowagifemefapupite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 5384 bytes
SHA-256: 57259b8a76bc1c55890d92d4262443dd13c6275e3e6d07465d15d6b9f0aa6872
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10184 bytes
SHA-256: 1ccda3dcca5bcf1114bf736c57631e936c57f2b06b102948888ddc3552293e11

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