Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffd0457bfd16029…

MALICIOUS

PDF

37.1 KB Created: 2020-03-29 15:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cbd746b90f3a8ebd267a31f3174fb259 SHA-1: a9cadb60f58231295a1b5adb13179ad5a5af1400 SHA-256: 8ffd0457bfd16029eafcb4d16f76bd9b83dd52a3a14d2e383c8e9162e9246ca9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of a link farm suggests the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://allamericandogexpo.com/uploads/1/3/1/1/131164180/131164180.html#buffalo+ts-htgl%2Fr5+firmware
    • http://alma-leather.com/uploads/1/3/1/3/131384081/8997c1ae864.pdf
    • http://gyronav.com/uploads/1/3/0/3/130323251/4bb89922d19d.pdf
    • http://impactcollab.org/uploads/1/3/0/5/130541064/lodogu.pdf
    • http://theopenedhearthealingcenter.com/uploads/1/3/0/5/130590357/5320496.pdf
    • http://3dfgo.org/uploads/1/3/0/6/130605421/masanevenesunivozod.pdf
    • http://movemissouri.com/uploads/1/3/0/3/130313803/dujigobewujajapuf.pdf
    • http://godsunbroken.com/uploads/1/3/0/7/130775800/napezebevufir_xerimazibifola.pdf
    • http://analytichisservices.com/uploads/1/3/0/6/130604690/c25b548777a.pdf
    • http://gosyart.com/uploads/1/3/0/7/130739891/8262203.pdf
    • http://bottomlinehits.com/uploads/1/3/0/9/130969445/kapakedabolo.pdf
    • http://ultimateairtime.com/uploads/1/3/0/7/130776763/9946936.pdf
    • http://luxuryquesttravel.com/uploads/1/3/0/6/130621330/loliw.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699f.bin
5ce2a426036fc1abb5f89bda34b2d9ec1a211f555ecc6ad3747a5b5c8d43fe24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 7620 bytes

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