Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a10d0467ab087e…

MALICIOUS

PDF

38.8 KB Created: 2020-04-11 10:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a9509939771a334a7e22a67c8c742447 SHA-1: 3cbe4d01b9de5cd7f4ba5b516f3b6d5c36951590 SHA-256: 62a10d0467ab087e4b521dc92a857383e68af749dbb3d3e6cedfd50220983374
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a phishing or content-luring scheme. No scripts were extracted, but the overall structure and URL distribution are highly suspicious.

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://74-123-72-68.mgwnet.com/uploads/1/3/0/7/130740249/130740249.html#the+things+they+carried+study+guide+questions
    • http://scratchiecat.com/uploads/1/3/0/2/130289426/nepenemefap.pdf
    • http://virginiaestradadesigns.com/uploads/1/3/0/5/130539881/6263787.pdf
    • http://prehabservices.com/uploads/1/3/0/7/130739889/bipovaxosudajofodeja.pdf
    • http://columnlighting.com/uploads/1/3/0/6/130605078/8452595.pdf
    • http://northoconeebaseball.com/uploads/1/3/0/3/130324289/votamo-tupek-juxin.pdf
    • http://dissertationwritingretreat.com/uploads/1/3/0/5/130539329/wuvane_vevaligijaxud_mamibimam_setedodaj.pdf
    • http://growersecrets.com/uploads/1/3/1/0/131070826/jodapugo_vazejitigux_daragasilek.pdf
    • http://let-us-clean.com/uploads/1/3/0/3/130323186/5794a3d.pdf
    • http://yourbestrealestateoption.com/uploads/1/3/1/4/131454394/zonimupuleji.pdf
    • http://beforethestorm.org/uploads/1/3/0/4/130435511/zajobawud.pdf
    • http://beebear.com/uploads/1/3/0/5/130547405/90906c2a5.pdf
    • http://charleeatkins.com/uploads/1/3/0/7/130739793/xobul_vewowatakazawoj.pdf
    • http://bigskysupply.shop/uploads/1/3/0/8/130814009/ziwuliwar.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_off00006e20.bin
4d447f79e02f8c831850798c4ee294ef05f6d8f030ba7ee6b3584cc96b0a9de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E20 7960 bytes

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