Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6b71e7be9b794e…

MALICIOUS

PDF

50.3 KB Created: 2020-03-16 13:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f3d242459997b165b33539f99eb2f6f SHA-1: 6fc39bdb62abeab160635077d30fa345a2dadc04 SHA-256: fa6b71e7be9b794e94f00f619e9471e76be2fbd0de53ae216e7e8286574d58c6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body text, though garbled, includes a URL that is also present in the extracted URLs list. This suggests the document is designed to redirect users to potentially malicious websites, possibly for SEO spam or phishing purposes. The ML classifier strongly supports the malicious verdict.

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://axolotl.co.vu/uploads/1/3/0/8/130873992/130873992.html#bbm+course+full+form
    • http://diamondlgoats.net/uploads/1/3/0/4/130477278/9f0b256dc779a6e.pdf
    • http://dadempire.com/uploads/1/3/0/5/130589216/paxuzanamurapo.pdf
    • http://www.beautyinyouhairsupply.com/uploads/1/3/0/9/130969062/zupelarumetuv-luwij.pdf
    • http://255alhambra.com/uploads/1/3/0/3/130323642/rafugakezob-fopofaferakomi-rusotikerubaja.pdf
    • http://westernstatescontractinginc.com/uploads/1/3/0/6/130603683/8008241.pdf
    • http://www.winnebagocountyghostbusters.com/uploads/1/3/0/5/130540507/7810349.pdf
    • http://acmeessence.net/uploads/1/3/0/2/130289019/lutelez_jezego.pdf
    • http://www.lenztrips.com/uploads/1/3/0/7/130775336/dopezisedodat_wisuv_voneriv.pdf
    • http://www.financialplanpro.com/uploads/1/3/0/7/130739330/perikisubipisu_garepukekefuri_dafuxupe_vunamozote.pdf
    • http://businessrescuene.com/uploads/1/3/0/5/130540525/9469564.pdf
    • http://career-competency.com/uploads/1/3/0/4/130483772/8300012.pdf
    • http://b-millers.com/uploads/1/3/0/5/130547150/ee8fb1.pdf
    • http://bhpmedicalconsultants.com/uploads/1/3/0/7/130739212/gazuvuriluge.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_off00009a81.bin
d644200d143ca7390d1a8bf7f0086f437c8545ab084e4ef30674320581a40ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 8456 bytes

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