Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1972c8b0938e37f…

MALICIOUS

PDF

29.6 KB Created: 2020-04-06 04:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4fa3aa851f4168581cffdd90f687edf SHA-1: 26f455d4de405421ac60564f8bcd79bc1821985e SHA-256: a1972c8b0938e37f85010d5c456ad9fade760c0452e59f45f418964ca4e0fd16
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that matches one of the embedded links, suggesting a deliberate attempt to direct users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kindspa.com/uploads/1/3/0/6/130605083/130605083.html#how+to+use+the+nescafe+dolce+gusto+krups
    • http://sacredyou.net/uploads/1/3/0/6/130621120/zanukimamed_bolotuwesu_getop.pdf
    • http://triathloncupen.se/uploads/1/3/0/5/130589238/09403bb50052.pdf
    • http://juliacdupuis.com/uploads/1/3/0/5/130540789/34f08067c3.pdf
    • http://engagemoremedia.com/uploads/1/3/1/0/131070619/zewurewatozugoteju.pdf
    • http://nexacreativeconsulting.com/uploads/1/3/0/3/130313145/nokijinew_gekanitegewu_lefakuwurete_finijow.pdf
    • http://americanfriendsofthefatherbashfoundation.net/uploads/1/3/0/7/130775752/mavulufubu-bunalazid-rimopobuxigixar-torobazuzegeso.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_off00004d1a.bin
f52b58ad6141528a439ad39192b991aa827acef06ff4caf5c411e2600ddd195c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1A 7312 bytes

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