Malicious PDF — malware analysis report

Static analysis result for SHA-256 2437636dec0c4ccb…

MALICIOUS

PDF

31.6 KB Created: 2020-05-14 13:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5caabbfc1a9d96dd7421c15d92562a7 SHA-1: 0a17ec30bdbe18dc2f5be31923e49513c3730895 SHA-256: 2437636dec0c4ccb4a56fcd7c6433ceb8031b1b0f4ff7ef4a1341988e2fcce78
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, characteristic of a link farm designed to manipulate search engine rankings or redirect users. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, pointing to multiple external PDF URLs hosted on various domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://saranlpcoach.com/uploads/1/3/0/7/130740492/130740492.html#ambrose+bierce+the+boarded+window+pdf
    • http://veteransdevelopmentgroup.com/uploads/1/3/0/3/130379627/3591561.pdf
    • http://prosser-snelling.com/uploads/1/3/0/8/130874666/tebixol.pdf
    • http://saraillana.com/uploads/1/3/1/4/131453230/rixujemibowaweven.pdf
    • http://monteschumacher.com/uploads/1/3/0/8/130874386/3398357.pdf
    • http://brighterawards.com/uploads/1/3/1/6/131606479/5694631.pdf
    • http://spicaengineering.com/uploads/1/3/0/3/130324418/d5f7228c211af.pdf
    • http://anitaniebuhresthetician.com/uploads/1/3/0/5/130588584/jixulanuririku-bisuvibo-letiwokuraf.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_off000053fa.bin
082fdaf642ff42d9d83e1a81c0b117b45b374fdb895ea5848f514e369ced29df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53FA 9224 bytes

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