Malicious PDF — malware analysis report

Static analysis result for SHA-256 c431388656e7f464…

MALICIOUS

PDF

76.5 KB Created: 2021-02-13 08:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dfcdf4808d79d8973f698522502ebd8c SHA-1: ea98cdcd588b5916465c040febe2689ba695c451 SHA-256: c431388656e7f4643380dc05295d9da5b06de699014e074f61a5d8a22f5e204e
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The heuristic 'SE_INVOICE_LURE' suggests a deceptive intent, possibly to trick users into downloading further malicious content or visiting phishing sites. While no scripts were directly extracted, the PDF structure and extensive link farm are strong indicators of malicious activity, likely involving spearphishing to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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://bologen.ru/aws?utm_term=best+powerpoint+template+for+business+plan PDF link annotation
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/280779.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/pjcjhVX/jeluvidibup.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/8705703719.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/UihJgjp/gofogatexevogivola.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hfidrif/ferojefapirunomevatot.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/nQhjmje/58726875275.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/kemepazoveved.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_5fe3152233442.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/vanezasemema.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/QBwhfih/planet_defenders_board_game_review.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/prophylaxis_endocarditis_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepukefaxefewe.rf.gd/ser_bachiller_2019.pdfIn PDF document text
    • http://wolumonixor.epizy.com/67988971588.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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 5328 bytes
SHA-256: da4de304f83997d2628c220e1035c1787718285fef20f4980852035b6fcdaba0
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10772 bytes
SHA-256: 997673425a9b2cb89cae0c086638f1e962becc07be8ac05cf913f531c9d6baf2

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