Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8201a772c69a78…

MALICIOUS

PDF

63.6 KB Created: 2020-06-04 09:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9682e00b959c66f9ab5a5b5831678a36 SHA-1: 2fce63b9a2ffae01d9e0cc084bff81f4385df8b0 SHA-256: 3a8201a772c69a786d14d6900b1516e336df2d5b7f4d8c846ae671cf55f1fb3f
136 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links predominantly point to domains with numeric or generic slugs, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially malicious or spam content hosted on these numerous external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://common-strength.org/uploads/1/3/0/9/130969762/130969762.html#marvin+mode+gothic+3 PDF link annotation
    • http://gorgeousngullyllc.com/uploads/1/3/1/3/131381259/5971516.pdfIn PDF document text
    • http://newwaysr-c.com/uploads/1/3/1/3/131379343/lozojurufalud.pdfIn PDF document text
    • http://djchronicles.com/uploads/1/3/0/4/130476697/7873402.pdfIn PDF document text
    • http://179.undesirable.us/uploads/1/3/1/6/131637176/9b56227d03.pdfIn PDF document text
    • http://billy-nelson.com/uploads/1/3/0/3/130313107/1ce1c1ce.pdfIn PDF document text
    • http://svtarms.com/uploads/1/3/0/6/130604601/kuzopixera.pdfIn PDF document text
    • http://50plussguiden.no/uploads/1/3/0/5/130541313/115701.pdfIn PDF document text
    • http://masonalexandereverettinstitute.org/uploads/1/3/1/8/131872015/relakamesem.pdfIn PDF document text
    • http://common-strength.org/uploads/1/3/0/9/130969762/terms.htmlIn PDF document text
    • http://common-strength.org/uploads/1/3/0/9/130969762/dmca.htmlIn PDF document text
    • http://common-strength.org/uploads/1/3/0/9/130969762/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vesuduk333682907.files.wordpress.com/2020/06/labasuximugibidogojunas.pdfIn PDF document text
    • https://xebamobakur757036922.files.wordpress.com/2020/06/nuvasigufaf.pdfIn PDF document text
    • https://gefanopo.files.wordpress.com/2020/06/16757066099.pdfIn PDF document text
    • https://fivulenis.files.wordpress.com/2020/06/97009482578.pdfIn PDF document text
    • https://janavojomeb.files.wordpress.com/2020/06/83427998985.pdfIn PDF document text
    • https://juwojoxado89904707.files.wordpress.com/2020/06/sediso.pdfIn PDF document text
    • https://rapevexed.files.wordpress.com/2020/06/3848982198.pdfIn PDF document text
    • https://mudobemazi.files.wordpress.com/2020/06/fibej.pdfIn PDF document text
    • https://derejawina.files.wordpress.com/2020/06/8652893518.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 10312 bytes
SHA-256: e2ddfc4e2a6fec6d5503219dde92ce4f65e0d06736d25bf3ab81b57a2fc5dd18
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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