Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ee7f992e27dbf5…

MALICIOUS

PDF

36.9 KB Created: 2020-04-04 13:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1629b8af1fdde964c94d14fea8643e26 SHA-1: c9fa32e9c3d10b6c8beff9de73882f907c1642a8 SHA-256: 50ee7f992e27dbf519b8193bfcaae3e8e2411ac2d8a9290fe90984cfcbc84004
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO link farms or to direct users to malicious sites. The document body, while partially corrupted, contains text related to citing theses in APA format, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links reinforces this assessment.

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://sidekickvsc.net/uploads/1/3/0/5/130544136/130544136.html#como+se+cita+una+tesis+en+apa+en+word
    • http://thefranchiselife.com/uploads/1/3/0/6/130604944/toxikovitotarejisa.pdf
    • http://arkk.biz/uploads/1/3/0/7/130740164/bafewisutujiner-moxubulinu-dekodiza.pdf
    • http://kknightswithdougherty.org/uploads/1/3/0/9/130969428/698620.pdf
    • http://gracechats.com/uploads/1/3/0/2/130272940/7973957.pdf
    • http://karimlemec.it/uploads/1/3/0/8/130874475/zisir.pdf
    • http://everyactoin.com/uploads/1/3/0/5/130551920/0242ab28330d78f.pdf
    • http://mindforyouth.org/uploads/1/3/0/4/130493476/mitotipikoroluto.pdf
    • http://tippopotamus.com/uploads/1/3/0/7/130740033/suzelisapumiju.pdf
    • http://minecraftserverlists.net/uploads/1/3/0/6/130605222/6849023.pdf
    • http://thelindseyreynolds.com/uploads/1/3/0/5/130590047/zawizejokupa.pdf
    • http://underrated.space/uploads/1/3/0/4/130477584/2c2d557e4c53.pdf
    • http://splendorosa.com/uploads/1/3/0/5/130539255/pixuro.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_off000064f9.bin
8446d6f5e5219ef93827c8927ea63a6e7c70f29d4ff0f307060ec9966cea689b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 8700 bytes

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