Malicious PDF — malware analysis report

Static analysis result for SHA-256 4625de8347120b18…

MALICIOUS

PDF

54.1 KB Created: 2020-04-10 02:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c882e6a9fa042a991880140744321f31 SHA-1: 3287c169ac64a42506a303de1a0a855eb21d2b5a SHA-256: 4625de8347120b18c7b930e88e334770f097e96b608237aa584473f986ab29ce
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content through the linked PDFs.

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://xrossingborders.net/uploads/1/3/0/5/130589070/130589070.html#motores+de+polos+sombreados
    • http://atasteofsummit.com/uploads/1/3/1/4/131483143/57cb5f5dd52f8e.pdf
    • http://donsullivanfineart.com/uploads/1/3/0/5/130543006/kewaw.pdf
    • http://smartmobilityusa.com/uploads/1/3/0/9/130969415/526fb26.pdf
    • http://bergenandcompany.com/uploads/1/3/1/4/131406153/vulid.pdf
    • http://myelectricalservices.com/uploads/1/3/0/5/130589125/pibirerile.pdf
    • http://compassionatelivingcourse.com/uploads/1/3/0/5/130543980/dodesepanakebus_nunukok_jatazelexox_juxumomulate.pdf
    • http://unikwities.com/uploads/1/3/0/3/130379151/7393228.pdf
    • http://sinmaps.com/uploads/1/3/0/7/130740391/sebarupojo_risavazubefo_ludusu.pdf
    • http://reversemortgageinfocenter.net/uploads/1/3/1/3/131383416/sujuxazikusemexoxi.pdf
    • http://activekidzyoga.com/uploads/1/3/0/3/130313323/1124609.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b1c.bin
de4ce61c2325953e135c68061318c9929b03f8b2ec2c27d7b1bf778824431706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1C 11152 bytes
font_01_sfnt_off0000c013.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC013 2828 bytes

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