Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c77f87db1f578b…

MALICIOUS

PDF

44.7 KB Created: 2020-04-10 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6a3857c49c59dee854d61def622dd3a SHA-1: dfe74822328d7963a13445a22a741a399b3e0056 SHA-256: d4c77f87db1f578bdc313c231a03940e44eb369291f62f01524eb59ead7c7876
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of outbound links suggests a high likelihood of malicious intent, possibly to lead users to phishing sites or malware downloads.

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://edness.com/uploads/1/3/0/5/130546136/130546136.html#voxelmap+1.+7.+10+forge
    • http://cyanedoriginals.com/uploads/1/3/1/4/131453394/nesukas.pdf
    • http://everythingassist.com/uploads/1/3/0/7/130775974/sosuzager_tusufel_dezagewirovopin_fabenenavozagud.pdf
    • http://thepairingkitchen.com/uploads/1/3/1/4/131452838/runobenameka-tawof-nisinan.pdf
    • http://alexmateer.com/uploads/1/3/0/2/130271184/2fe0fff9.pdf
    • http://spessart15.de/uploads/1/3/0/6/130620952/6020992.pdf
    • http://lisathomas-designs.com/uploads/1/3/1/3/131380618/vuzezemivila-sawunepatore.pdf
    • http://junkremovalinbakersfield.com/uploads/1/3/1/4/131407974/7668498.pdf
    • http://bcschools.org/uploads/1/3/0/6/130605228/buvefanu.pdf
    • http://aeatours.com/uploads/1/3/1/3/131381769/9826084.pdf
    • http://boulderacupuncture.info/uploads/1/3/0/6/130639170/3113862.pdf
    • http://poledancestars.net/uploads/1/3/0/6/130604980/4854846.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_off00006d92.bin
9b230114f588c38bc691c44de50244589cbaade22357c3662114eab63a0332b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D92 8836 bytes
font_01_sfnt_off00008f79.bin
81df44247aa6368ee4f5613fd77267ee6cd66bd9e993d06b683ce941502b9c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 16064 bytes

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