Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1e9943bc09a3a2…

MALICIOUS

PDF

29.2 KB Created: 2020-05-13 14:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1264ba216f01faf2947cd1b1552b0925 SHA-1: 3c74e766ae2b397a836fe52bd45b98f38983fc2a SHA-256: bf1e9943bc09a3a292dd4bc2d1550e9e06e3f2731176880eacf6407220c768a0
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The presence of numerous, similarly structured URLs suggests a coordinated effort to distribute content or redirect users, potentially to malicious sites or for SEO manipulation. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://carpetcleancary.com/uploads/1/3/0/7/130738792/130738792.html#nice+guidelines+appendicitis+antibiotics
    • http://touchscreendjs.org/uploads/1/3/0/5/130588772/a1c5d.pdf
    • http://rakagrosirbaju.com/uploads/1/3/0/4/130478004/05f9e5461.pdf
    • http://selfmixinghennadye.com/uploads/1/3/0/6/130604270/3eafa2.pdf
    • http://handmadebyavenue.com/uploads/1/3/0/4/130483756/mudezedokazukus_gejagosugima_xijuvotiruvip.pdf
    • http://uabadmontas.com/uploads/1/3/0/8/130814966/bodokomujatafi-lawak-vijeneb-zuvilow.pdf
    • http://sophsdiys.com/uploads/1/3/1/4/131453119/jopodejudumituwijod.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_off000049a3.bin
83c4f8b2b27454bb8a2ade4ea1723b53a0f8cf1d12eb12f47c2fe45455445aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49A3 9492 bytes

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