Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9fd35dec376c11…

MALICIOUS

PDF

33.7 KB Created: 2020-05-16 06:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e0a351b8187788a8d0a5cfb42379d7 SHA-1: 636646f1e33c477ea745a4433b4e5977023914f9 SHA-256: fa9fd35dec376c117efd87461d37fcd26183d27afc3f07e2615ade3770faacc0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cibumtropical.com/uploads/1/3/1/3/131380438/131380438.html#graph+paper+template+10x10
    • http://coachintegralsistemico.com/uploads/1/3/0/6/130639803/sirivijox-xozamabezup.pdf
    • http://roberttalksbusiness.com/uploads/1/3/0/5/130539935/6911343.pdf
    • http://televerge.com/uploads/1/3/0/6/130620470/temuxakikake.pdf
    • http://greatergoodsteam.com/uploads/1/3/0/6/130639678/3186779.pdf
    • http://mysticalkristi.com/uploads/1/3/0/4/130488626/5166d6c7ac8.pdf
    • http://childrensbhc.net/uploads/1/3/1/1/131164093/gezisafo_wuxaxawepabizep_mufavodo_zuroledomip.pdf
    • http://civilwarbattles.org/uploads/1/3/0/5/130588508/wixezugiwegokoj_vinase_sumebul.pdf
    • http://eastbayerectorsinc.com/uploads/1/3/0/6/130604613/a1d61582d.pdf
    • http://hospitalityelevatedllc.com/uploads/1/3/0/6/130640040/zudefugubodob.pdf
    • http://frannychicago.com/uploads/1/3/0/3/130379315/voripijiged.pdf
    • http://crystalenergyprotects.com/uploads/1/3/0/2/130289154/9521d.pdf
    • http://alchemysafety.com/uploads/1/3/0/6/130620926/nupeke_gatepalap_jokinutufilel_mepubifevuwivul.pdf
    • http://drive-lah.com/uploads/1/3/0/5/130589420/nabek_sater_risutu.pdf
    • http://stagedoortheatreok.com/uploads/1/3/1/3/131379596/f3866be5eb537a.pdf
    • http://gduhe.org/uploads/1/3/1/4/131406843/71954f7.pdf
    • http://williamsburgbotanicalsllc.com/uploads/1/3/0/5/130589191/11b9e.pdf
    • http://izingelectric.com/uploads/1/3/0/9/130968915/a9d5c3a48d92c.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_off00005c27.bin
defb1436ff442cc8fcaf287ecf4df65a7036114673bad2217e11b1590691453b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C27 9088 bytes

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