Malicious PDF — malware analysis report

Static analysis result for SHA-256 f856bfb8cf6a1f08…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 18:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 773f0b7364c31490388ba97729cb2353 SHA-1: 88f68a8437a92a94e16fb85d4c7026f46b9581f0 SHA-256: f856bfb8cf6a1f0811f2d27cf4c7d17f35ad8bd6ab999254a06a843a462d288d
186 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

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/123?utm_term=oven+cooking+ham+joint PDF link annotation
    • https://cdn.sqhk.co/tedavevata/ihaGigT/weeds_cast_season_3_episode_1.pdfIn PDF document text
    • https://gitibufilunaj.weebly.com/uploads/1/3/1/4/131453558/jexifewami-wemopuditobiru-simolekepanekem.pdfIn PDF document text
    • http://jiwitoletazadag.iblogger.org/somubakotol.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/kizigixawikifotemif.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/3417840.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/lumutizabi.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/jjgjjji/.pdfIn PDF document text
    • http://fastpysystem.online/volobisujufexediva53r8.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/gfzjggd/tik_tok_par_video_banane_wala_app.pdfIn PDF document text
    • http://chambreop.xyz/clothes_and_accessories_vocabulary_worksheetsn4i7x.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/pisikixoxapim.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/6949129.pdfIn PDF document text
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/gijosugererirugi.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/jz8qYne/15951202173.pdfIn PDF document text
    • https://mofesifejizovis.weebly.com/uploads/1/3/4/7/134749503/7500743.pdfIn PDF document text
    • http://aromaita.space/18233117587owzam.pdfIn PDF document text
    • http://ekzo-fruit.ru/libros_de_enrique_barrios1xku2.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/jThbUjg/wijodiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiromenabagagi.rf.gd/47652724915.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_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 5136 bytes
SHA-256: ee9fb07060c179e1e8bc0d40af37d8be3c964e792d6fbfc803028a071c15a25c
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 12084 bytes
SHA-256: 32130021d6f16ddb9dcf5c84c34e5a2317ef2e10067bfa1c5bb15dfb4cdc5085

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