Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61d3cdbc74fcf37…

MALICIOUS

PDF

71.7 KB Created: 2021-01-13 15:38:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 410c3d5c65d8b6f7be7bc040c14a4c9d SHA-1: 236c46349eeb6a4514d5df6484ce19125202dae0 SHA-256: a61d3cdbc74fcf37052258ad5f6e453e7a3bbc6a546dd290fe97bd6576a5f185
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=harvard+bluebook%2528+19th+edition+citation+format PDF link annotation
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/a7ca1a5bc1d.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/Hvkxjh1/momifurerupaxeruviwa.pdfIn PDF document text
    • https://zorelivuveromip.weebly.com/uploads/1/3/4/4/134438733/5a6a66a81cc.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/zedapebiximipopopuwe.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/wimimulowopamu-kavipa.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/kjbygfc/callaloo_plant_jamaica.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hIihhaM/vuvimomudupuropax.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/pesomug-lumirikuf-nijixadufufa.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/geiflHn/mobile_patrol_missouri.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/dokitegiwati.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/subud/vertebrate_zoology_practical.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/pap_guidelines_algorithm.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/vsco_full_filter_android.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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 5596 bytes
SHA-256: 5125345f01bc02bbd42bb339846095825f072aa6f87fd6326ab03e44cb9a1ca0
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 12172 bytes
SHA-256: fcd21484906ea33b1dd2406ffe76e02c367cdbe82e77063191e4e29f06f2bfb1

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