Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b9e73a87784cf5…

MALICIOUS

PDF

37.2 KB Created: 2020-06-20 22:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdfa0f48fe6b7042a9c801a09eedfeba SHA-1: eed237a2d989e6ee21ce2cf0cd27e3b45da3e15b SHA-256: 71b9e73a87784cf52b217980b018bb12ac690c4ea266375f5ce39b028a36663d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to suspicious domains with numeric slugs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous external links is a common lure for phishing or malware distribution. No scripts were extracted, but the sheer volume of external links is the primary indicator of malicious intent.

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://tnknutson.com/uploads/1/3/0/8/130815482/130815482.html#church+membership+class+pdf
    • http://geekswithdice.com/uploads/1/3/0/5/130546415/6310940.pdf
    • http://chrisfindlaybooks.com/uploads/1/3/0/2/130291635/9d24c31d5c5b8.pdf
    • http://pjdtranslations.com/uploads/1/3/0/6/130605452/80ac17.pdf
    • http://ivyfoxfashion.xyz/uploads/1/3/1/3/131383864/fojodisas.pdf
    • http://jackmarcin.com/uploads/1/3/0/7/130740092/9b701c34.pdf
    • http://viennarooms.com/uploads/1/3/1/6/131606951/desevexizar.pdf
    • http://thenakedwrist.com/uploads/1/3/0/7/130775622/dufitakanewedib-vovovusavax-wojoxo.pdf
    • http://manuelaferretti.ch/uploads/1/3/0/6/130604141/duzibodeli.pdf
    • http://fangqiwen.com/uploads/1/3/0/3/130323733/8552301.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000539e.bin
5db88f941f7b3420077bc887e0df33336fc1c7c29b4e5195e8fd10202149ee51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539E 5144 bytes
font_01_sfnt_off0000650b.bin
634af626f493689e2e03cb6276feb79c64945abddbce281105c310b0a4aba43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 10364 bytes

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