Malicious PDF — malware analysis report

Static analysis result for SHA-256 6539c94beb9a66df…

MALICIOUS

PDF

94.8 KB Created: 2021-04-04 20:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6736215fbb1629a07373b800a69d92f6 SHA-1: d9a64ef749e2b97f76d7c61fb2f266155bf3850f SHA-256: 6539c94beb9a66df21b0a32b9ea43289595afd7aa638613edf163c23f2976afc
194 Risk Score

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 designed to redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document may use deceptive content to encourage clicks. While no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lozipotod.ru/wix?keyword=chambers+county+tax+office+eagle+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409098/normal_605feabb15ba2.pdfIn PDF document text
    • http://vivadoctor.ru/decimal_place_value_games_printableozdxg.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/a7717aaee5d69f8.pdfIn PDF document text
    • http://ludesajezopaju.medianewsonline.com/87459909162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5fdbd64c311a3.pdfIn PDF document text
    • http://sethel.xyz/luginigujaserubu8grnu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fd09b4a50749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_6006e60e2c7c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fd3692d86b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_603410f834017.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/genki_2_workbook_answer_key.pdfIn PDF document text
    • http://prostochillforum.fun/414192580619xtm7.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/liver_abscess_pathophysiology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481819/normal_601de6240c266.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/what_are_the_questions_asked_in_logistics_interviewuwiwz.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/sovatafisuraxosugugezods1z6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_605ae5413fdae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_6046b3c9dd8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_6057c32f2c986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5ff39e00a7897.pdfIn PDF document text
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/4751094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5fdfb14b5019f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 5708 bytes
SHA-256: 58d7e188439f4e601837a2771b035a815086e2e53e9a1841295b7ed4039690c3
font_01_sfnt_off00014517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 11900 bytes
SHA-256: 9f17dc737aa18737008afa2674138107aa84a2e2e708e30f09a47377e56513a5