Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb630fc81d213f…

MALICIOUS

PDF

37.4 KB Created: 2020-03-30 03:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea02f51c663a61bd66a9336046656356 SHA-1: 7c3d780e7eb094ad71350a227f07776c77740b5a SHA-256: 4feb630fc81d213f481ea64f6282f0ba2945f1da8de54e02e301a32aa098da15
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. The document body, though heavily obfuscated, contains references to a 'propane heater' and the wkhtmltopdf tool, suggesting a lure for potentially unwanted or malicious content hosted on the linked domains.

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://bejustalittlebetter.com/uploads/1/3/1/4/131437513/131437513.html#glo-warm+propane+heater
    • http://digitalcitizenship-drdbailey.com/uploads/1/3/0/3/130312923/bunura.pdf
    • http://jjhandywork.com/uploads/1/3/0/2/130287428/10eb784dbf146.pdf
    • http://andrewdpaterson.com/uploads/1/3/0/6/130639233/7b222fb2d13.pdf
    • http://maltaescapes.com/uploads/1/3/0/6/130620885/5377192.pdf
    • http://thevillagesffa.org/uploads/1/3/0/6/130605182/xadaguzojo-vimigukedoxaki.pdf
    • http://powerpackedlearning.com/uploads/1/3/0/2/130289319/5377246.pdf
    • http://berneicehilly.com/uploads/1/3/0/4/130490245/a47beb.pdf
    • http://nybellhouse.com/uploads/1/3/1/4/131438197/24dfca11.pdf
    • http://bizpatch.net/uploads/1/3/0/7/130775429/masita-vanivoloxuna-wojavuzanuf.pdf
    • http://comercialdoorsllc.com/uploads/1/3/0/5/130588556/pamujavu.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_off00006822.bin
4b109d1f438f00ae9741129c40ccaaf21f70ad3d966e122ea91fcb0c322b54dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 8676 bytes

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