Malicious PDF — malware analysis report

Static analysis result for SHA-256 40751286cee4e407…

MALICIOUS

PDF

39.1 KB Created: 2020-05-19 22:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 3c2a33380bf17016940fe085ccf24f76 SHA-1: 78d1623794468a9358a6d3a6c0115c31aa120bd3 SHA-256: 40751286cee4e407c9289bc3bd49df6f75cfc29d4dfd5be40a4c0e2a83fd5f8e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, contains references to 'bookstore management system document' and includes numerous URLs pointing to PDF files on various domains. This suggests a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 4

  • 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.
  • 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 http://axistenceoutdoor.com/uploads/1/3/0/5/130541465/130541465.html#bookstore+management+system+document PDF link annotation
    • http://stgeorgecountrydancing.com/uploads/1/3/0/6/130620746/518e3cc72a.pdfIn PDF document text
    • http://mccormickslaw.com/uploads/1/3/1/4/131453723/049fb63af.pdfIn PDF document text
    • http://earlybirdphonics.org/uploads/1/3/0/6/130621839/a2c36ad29a83ac0.pdfIn PDF document text
    • http://roelandstrading.com/uploads/1/3/0/4/130476791/f4a5b2cbed74.pdfIn PDF document text
    • http://alphaelectrical.org/uploads/1/3/0/4/130483795/wibupalis_ligodilo_vewapuz_pixizopiwefawis.pdfIn PDF document text
    • http://toadandpickle.com/uploads/1/3/1/4/131407823/1235326.pdfIn PDF document text
    • http://prg5.com/uploads/1/3/0/3/130324191/1229487.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F36 10104 bytes
SHA-256: bbd7ca3f4cc4c7b032521829ff5e96986f0a7145b06bbca11bdb4f89d72d5e0c

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