Malicious PDF — malware analysis report

Static analysis result for SHA-256 d316c8f0aedd38e4…

MALICIOUS

PDF

37.8 KB Created: 2020-06-21 07:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 6142e23708848553b92c3d1802327210 SHA-1: 58731cc10f4a89a484407fc45cdc85399f08d7ec SHA-256: d316c8f0aedd38e460102dc66e07a17475c07c7f8e6173bd1bfaf3e6f9fdfadd
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm, with multiple external URLs embedded within the document body. The document title 'Can kegel exercises increase size' appears to be a lure to attract clicks to these numerous, potentially malicious, external links. The presence of many such links suggests an attempt to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kelaisileyulejiudian.br3h.com/uploads/1/3/0/7/130740618/130740618.html#can+kegel+exercises+increase+size PDF link annotation
    • http://mentallilness.com/uploads/1/3/1/1/131164481/nemopoze.pdfIn PDF document text
    • http://shop.kilduffmachine.com/uploads/1/3/1/8/131856826/8476169.pdfIn PDF document text
    • http://jastephensonlaw.com/uploads/1/3/0/6/130604042/mepuk_mepufegu.pdfIn PDF document text
    • http://handmadeky.com/uploads/1/3/0/7/130776646/f789e2.pdfIn PDF document text
    • http://lorrainepeignefineart.com/uploads/1/3/0/7/130739688/dc526030f8.pdfIn PDF document text
    • http://sydney.awrc.org.au/uploads/1/3/0/6/130604355/7b593c1.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5810 4768 bytes
SHA-256: b1e42e963ced5f22420f2a15363a3e622536f8b388e00e0a14fa436e3bb02795
font_01_sfnt_off00006851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 10356 bytes
SHA-256: e3cd3c25a58c4fb3a198959b3d269569182641e6eb950cdf6d987361f07a2b31

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