Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82aa6ccb28225e8…

MALICIOUS

PDF

75.0 KB Created: 2020-12-26 07:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b7688aed7a415c362f81f5b9ccc269e2 SHA-1: e5bfcb81f2ecd7c3f424d3e4db94ed47018694e3 SHA-256: a82aa6ccb28225e8aaac5e7e7e86d739495901c91b98f0aa5b8989ba959e93a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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://traffset.ru/strik?utm_term=granny+square+afghan+crochet PDF link annotation
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/foxopafovoki_timibujori_gotidodululatek_sokasi.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/hj7hevN/nixovas.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/jfYigic/92685207997.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/563354.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/196853.pdfIn PDF document text
    • https://sizemerekev.weebly.com/uploads/1/3/1/6/131606963/5c3d487dc30cf.pdfIn PDF document text
    • https://sopakefexije.weebly.com/uploads/1/3/4/3/134398413/zabadizizov-zejusivisa.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/2e0ae026977.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/f0a0b5a1-b9b3-4a98-b490-1dfbcc84be6f/balrog_guide_maplestory_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b17693-2a1f-4b4b-9dc1-864252852e1c/mortal_kombat_snes_moves.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/gizuwov.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5368 bytes
SHA-256: 6ec70bb270479125f3ce0bb7f2d2bd8b76ccfbb2b1633e7f53d45326ba0f48aa
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 10700 bytes
SHA-256: 96c81151b7082ea5038a5989baee8d7710879df289365ce9f2a1e83e6bfd3fc4

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