Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b602598f2faac3…

MALICIOUS

PDF

72.6 KB Created: 2021-02-06 02:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84cf7be6b2038b675ffd50e3fd3c4193 SHA-1: e0bf03c8cf715492a53f3cf29b186c29c332d2a5 SHA-256: d5b602598f2faac3380b1580467d4dabc31fabed533c41336dbf94b8dddab0fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. The heuristic for a visual download button further supports the lure-based attack pattern.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=mantra%20biometric%20device%20software PDF link annotation
    • http://lnstagramsupportingcenter.com/chaar_sahibzaade_1_filmja65z.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/nuzurifetunak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fd1c96562fc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_6002735b0f7b4.pdfIn PDF document text
    • http://coloradocustomelectric.com/estimating_in_building_construction_free_downloadl2wh5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5feb3fc9585b7.pdfIn PDF document text
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/a0aa1c1c9f9db4.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/a82404a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_5fdc6166cc91a.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/igjpnN8/art_therapist_masters_online.pdfIn PDF document text
    • https://cdn.sqhk.co/semexixok/jgubUht/95303200834.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/G1idBjd/who_moved_my_cheese_haw_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417809/normal_5ffa1a7a891e5.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/4325579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5fdbbcd4a14d2.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/4654949894tzj2n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fffb8ba318a7.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/megelugik/49409053746.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/rukotazivamanesinadafuteb.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/75881552388.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/outline_for_an_argumentative_essay_template.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 5432 bytes
SHA-256: 9338492537bce80ff9d5684c8a7e69fdf18e962d9e57f016fe9564062c086dee
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10512 bytes
SHA-256: 859fcf896dcc25a53bd8d864eeb98c902dbcd2e528bba32e355d48ed69dcb810