Malicious PDF — malware analysis report

Static analysis result for SHA-256 341a1ab9aa90b7fd…

MALICIOUS

PDF

27.8 KB Created: 2020-05-21 21:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75942b21de5a729edb5b66e5928c5676 SHA-1: 25dfe42845638c3bcb84c2ce26f38be6e0e683b1 SHA-256: 341a1ab9aa90b7fdb2b31c7293f497e0a987b2585adf8a3737cc4d35370a09db
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded document body text, though heavily obfuscated, contains URLs that are also listed in the extracted URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack pattern involves directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://theneighborhoodsocial.com/uploads/1/3/0/4/130483153/130483153.html#alternate+start+skyrim+vr
    • http://kindermusikindy.com/uploads/1/3/0/8/130814328/cbf5910dafc6.pdf
    • http://imadiva2.com/uploads/1/3/0/7/130740117/61ea97f.pdf
    • http://reconstructivewellness.com/uploads/1/3/0/4/130435821/pivazeneximuko_puwozagadavexu_konigiw_banidamixaw.pdf
    • http://nursekaneisablellc.org/uploads/1/3/0/7/130739060/7246295.pdf
    • http://travelbugtour.com/uploads/1/3/0/6/130621734/1746224.pdf
    • http://vipschoolofcosmetology.com/uploads/1/3/1/3/131384208/bepozixosuj.pdf
    • http://aboerng.com/uploads/1/3/0/2/130289246/6165598.pdf
    • http://thermasculpt.net/uploads/1/3/1/4/131437756/kugakugij.pdf
    • http://untabbed.com/uploads/1/3/0/5/130543074/5164550.pdf
    • http://harvardofthewest.org/uploads/1/3/0/4/130476454/20b70.pdf
    • http://sixfigurebankaccout.com/uploads/1/3/0/8/130874035/zumaxavuritujija.pdf
    • http://worthpersonaltraining.com/uploads/1/3/0/5/130550715/2a944ba21.pdf
    • http://optimusseeds.net/uploads/1/3/0/8/130814346/buvonibusewe_donisevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046c4.bin
3d6739e4484454e61e70f527d5813bcf33f9a696944008386ec2228eb3ff0baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C4 8616 bytes

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