Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2017a8c51cb4e24…

MALICIOUS

PDF

36.3 KB Created: 2020-04-12 14:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f429133411bc6ad862b5593ab65201f6 SHA-1: c744e9bf92b67dd1baaa9208dbc41eb55d0ba232 SHA-256: d2017a8c51cb4e249c022f97c89358a0cc1d2ed8ac6469efc47877b67774796e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm designed to distribute malicious content. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, indicating a high likelihood of malware distribution. The document body, though partially corrupted, contains text related to group dynamics, likely used as a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://fit1athletics.com/uploads/1/3/0/5/130539818/130539818.html#dinamicas+para+romper+el+hielo+en+un+grupo+de+adultos
    • http://soulsnatcher.shop/uploads/1/3/0/4/130483507/mofewofedozile.pdf
    • http://pearlstravel.net/uploads/1/3/0/8/130813550/83e8a.pdf
    • http://stjohnpaulcenter.org/uploads/1/3/0/4/130435570/7955061.pdf
    • http://petraweith.com/uploads/1/3/0/2/130291328/fowugimegipoda_mimijo.pdf
    • http://nickihumblesbridalbeauty.com/uploads/1/3/0/7/130740318/zivuwumuzijelarirab.pdf
    • http://ryegentrytrucking.com/uploads/1/3/0/9/130968934/5821379.pdf
    • http://uxwcdconference.com/uploads/1/3/0/7/130738681/6138286.pdf
    • http://ryegentrytrucking.com/uploads/
    • 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_off000062d7.bin
a3184e5c103a7fd9e3631f022e22dd1597b30bc2b6e56e4674ce59bc44096546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 9028 bytes

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