Malicious PDF — malware analysis report

Static analysis result for SHA-256 a061b6d8cb832799…

MALICIOUS

PDF

34.8 KB Created: 2020-05-30 14:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee77253f14f32ee29aa9362fb501d197 SHA-1: 58b390daf2fa9df079bff1f9c3945f611bb7f14d SHA-256: a061b6d8cb83279925dd18d6c0c1dc3b663ae03b9a230e6122864f0fef3c6562
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the creation of a link farm, likely to manipulate search engine results or to distribute further malicious content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fixingking.net/uploads/1/3/0/7/130740011/130740011.html#canto+ana+becoaj
    • http://manebraid.com/uploads/1/3/0/6/130639349/felog-sivuwo.pdf
    • http://moosetracksmi.com/uploads/1/3/1/4/131437689/866820.pdf
    • http://clippertrimmerparts.com/uploads/1/3/0/7/130739068/mimekazex_bovesubifi.pdf
    • http://tiemponails.com/uploads/1/3/0/4/130490875/7900106afd33.pdf
    • http://pacificrimae.com/uploads/1/3/1/4/131453335/2605649.pdf
    • http://annkellettwriting.com/uploads/1/3/1/4/131438091/066cdacb5293fb.pdf
    • http://minimunchkins.org/uploads/1/3/0/5/130551457/39cf0c.pdf
    • http://source1job.com/uploads/1/3/0/6/130639418/legoperuba.pdf
    • http://carolinaerosioncontrol.com/uploads/1/3/1/6/131637152/858646.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_off00005cd0.bin
e63a1f5454f97f4c43597041f27ecd9961b07d54fe7ae1841a90426f94c10c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD0 11464 bytes

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