Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d24d60c36d883f7…

MALICIOUS

PDF

74.2 KB Created: 2021-02-24 16:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d59f899dff3091fda0079786fad3f504 SHA-1: 1b3ed9535441704a445fd907ee5f37cd51fe6d9b SHA-256: 3d24d60c36d883f7d031d4080e819e982e722b7f122568d47ed94f50ed3acd01
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=what+is+the+cost+of+pulse+oximeter+in+india PDF link annotation
    • https://cdn.sqhk.co/vafodagusun/ijigsjg/74112984189.pdfIn PDF document text
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/siluboj.pdfIn PDF document text
    • http://ketorebagibof.22web.org/python_string_format_replace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fde5d5b93693.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/aiaZjjq/pamarizomomedosowuvarekul.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/bunupuzojukatizisup.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/zanojajo.pdfIn PDF document text
    • http://mapimiz.22web.org/kegop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_60168fb6c2cfd.pdfIn PDF document text
    • https://zonulufeviwupaz.weebly.com/uploads/1/3/2/8/132814448/zufesejujesedoma.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/gfUVjaB/pac_man_game_boy.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/5634472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fe7c3ef4e5da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifavar.epizy.com/free_chicago_apartment_lease_form.pdfIn PDF document text
    • http://dasilumenuf.rf.gd/sifuzebeli.pdfIn PDF document text
    • http://nigiragesowujow.epizy.com/podaletikalixorubuzo.pdfIn PDF document text
    • http://norilonabu.epizy.com/93241083470.pdfIn PDF document text
    • http://bosurigazo.epizy.com/65679855252.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/jikiwesirudaji.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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5476 bytes
SHA-256: 76c45e5cd95282665a6984cd52ad3a5033ca0a46fdf288a3d7bdb2f67e396ac0
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10628 bytes
SHA-256: b27a058750d9f563b3cb33960b0e56916e3105edb51f7eebc7c3eea76391e432

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