Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fafa01fbc9f45f…

MALICIOUS

PDF

36.3 KB Created: 2020-04-07 15:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0573ed3d02d5e8ed02a5b04f2eacce0 SHA-1: d95c568b8481ffaf98bdc9009a2295a6726ac28e SHA-256: d8fafa01fbc9f45facf222f1ac9a564014944488752e5fb501fe687bf2f4b6b8
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, many of which point to domains structured similarly to SEO link farms. The document body, though partially obfuscated, contains text related to legal contracts and the wkhtmltopdf tool, suggesting a lure to a network of potentially malicious or spam-related websites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link-farming or phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kymmiskk.com/uploads/1/3/0/2/130288893/130288893.html#contratos+tipicos+y+atipicos+mercantiles
    • http://albatrosshomebuyers.com/uploads/1/3/0/6/130621048/9ebe8a1892ef561.pdf
    • http://loveejade.com/uploads/1/3/1/4/131437822/temajoxanodijaw.pdf
    • http://turnofthewheelzines.com/uploads/1/3/0/2/130287279/7351706.pdf
    • http://koreenergyltd.com/uploads/1/3/0/9/130969717/vurutarigexigupo.pdf
    • http://grizzlyrentalsonline.com/uploads/1/3/0/7/130775715/07ab702.pdf
    • http://mta-sts.sprachbruecke-berlin.de/uploads/1/3/0/6/130604493/3989038.pdf
    • http://matesicmethod.com/uploads/1/3/0/7/130738614/3557898.pdf
    • http://wdaoklahoma.com/uploads/1/3/0/5/130538981/79d12cad9.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_off00006313.bin
a7dd6b1caa016b6c8bfef9d3661a60d7c8184f917ac22aa5d6324b5d58731234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 8892 bytes

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