Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4060bd4cd5fb0dc…

MALICIOUS

PDF

43.7 KB Created: 2020-04-23 17:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d7ad33497e826d57d7f884a45d9746b SHA-1: 3938a31bc01d306b0b30b898ed86677d586d8960 SHA-256: d4060bd4cd5fb0dc6b0c54307b7b9e0c9c3076b8b4a8a647591bb7d8c0924e29
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a lure for users to click through to potentially malicious content.

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://beaverdamchurchonline.org/uploads/1/3/1/3/131379353/131379353.html#hey+there+delilah+instrumental+free
    • http://endwarlistentoearth.com/uploads/1/3/0/2/130291438/6ef361d984ef.pdf
    • http://india108.com/uploads/1/3/0/8/130874517/kidiwilor-fapejul-gitibivumokugoj.pdf
    • http://ishiro.com/uploads/1/3/0/7/130738753/vetegegejim.pdf
    • http://kateleadleyfreelancewriter.com/uploads/1/3/0/9/130969855/zolasofijafove_xutufebem_xekuzinofigeg_fabajokefevamu.pdf
    • http://gcagriculturalspraypainters.ie/uploads/1/3/0/7/130740556/899c893f.pdf
    • http://thelipsticknetwork.com/uploads/1/3/0/4/130483546/1052150.pdf
    • http://shopminez.com/uploads/1/3/1/6/131637271/rapiravamu-zuvudofekogiw.pdf
    • http://thesagaciousone.com/uploads/1/3/1/4/131454440/fb7cd620bc76.pdf
    • http://churchofeternalpromise.org/uploads/1/3/0/6/130621127/1192051.pdf
    • http://thecaninecook.com/uploads/1/3/1/4/131483465/583340de136a.pdf
    • http://cleaningsantabarbara.com/uploads/1/3/0/3/130379105/2390011.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_off00008067.bin
1f3c2bb8440ed95027c069a22d5eabcb36728955c38233fbe926fd220ee2f9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8067 8856 bytes

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