Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6361ddebf87445…

MALICIOUS

PDF

35.7 KB Created: 2020-04-12 10:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-12-25
MD5: efc5d2059fba19efe2a55beca312fb78 SHA-1: 795b56cea57cc1e29785e42e81410f9539107d66 SHA-256: 6d6361ddebf87445c1c2df780e3a565497dd5a3a959e76bdde7baa77098efef0
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to seemingly unrelated PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the presence of many external links is a common technique for distributing further malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://priscaspiggies.com/uploads/1/3/1/4/131455475/131455475.html#left+eye+periorbital+hematoma+icd+10 PDF link annotation
    • http://gcodespecialistllc.com/uploads/1/3/0/8/130814341/bibat.pdfIn PDF document text
    • http://alphamediaagency.com/uploads/1/3/0/7/130738673/penuzozubez.pdfIn PDF document text
    • http://jdaei.com/uploads/1/3/0/6/130621200/2513498.pdfIn PDF document text
    • http://elevatedmorsel.com/uploads/1/3/1/3/131381052/9c18a28cf.pdfIn PDF document text
    • http://royaltygiftware.com/uploads/1/3/0/7/130740375/1f98b4fb40428.pdfIn PDF document text
    • http://firstclasscouriers.net/uploads/1/3/0/7/130740420/tutipanerex.pdfIn PDF document text
    • http://didis.net/uploads/1/3/0/5/130590122/voxosapo-gamenag-soxuli.pdfIn PDF document text
    • http://avskinspa.shop/uploads/1/3/0/4/130488073/farawot_dujopefabokes.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 7256 bytes
SHA-256: befeadf958ab53dbdc0b048b4138a3408ff07eed63205fe7ca4d828e3fd898ac

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