Malicious PDF — malware analysis report

Static analysis result for SHA-256 b941ba71fed54cb3…

MALICIOUS

PDF

43.5 KB Created: 2020-04-09 05:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0998a3566bd1cb9926af56336ebe6c92 SHA-1: cab371e3113520f21d81b55922b730e25dc59b15 SHA-256: b941ba71fed54cb3407501cc1a0052102a855b0b3e8a163ee2c67e97b483f487
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though partially obfuscated, contains a URL related to a Vicks vaporizer, which is likely a lure to direct users to malicious content hosted on the numerous external domains. The ML classifier strongly indicates maliciousness.

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://mellmadedesign.com/uploads/1/3/1/4/131453451/131453451.html#how+to+use+vicks+pediatric+warm+steam+vaporizer
    • http://littlerookie.de/uploads/1/3/0/4/130436139/kerarorujapopox.pdf
    • http://dylanwyke.com/uploads/1/3/0/2/130270895/e695942.pdf
    • http://weddingvenuesitesinnh.com/uploads/1/3/0/2/130270849/pededumaliw.pdf
    • http://leonardo-chems.com/uploads/1/3/0/2/130274376/2571934.pdf
    • http://e-find.hk/uploads/1/3/0/4/130493816/nemuninagepes.pdf
    • http://wildhorsesanctuary.net/uploads/1/3/0/4/130489763/a5869e1f8782a68.pdf
    • http://cdtacjohnsoncontractorsinc.com/uploads/1/3/0/9/130969686/mejadan-disawowasazuw.pdf
    • http://nyaticapital.com/uploads/1/3/0/5/130551095/8325583.pdf
    • http://nest-well.net/uploads/1/3/1/4/131406658/fegulito-mukafogodad-kepewaxinazibem.pdf
    • http://profetu-ardelean.com/uploads/1/3/0/2/130273872/toxonorawipop_dugobuzubuzovem.pdf
    • http://jacktherippermuseumwalk.com/uploads/1/3/1/3/131379643/libeger_zebaro_taxiwaletale_bixujod.pdf
    • http://ketoabetterbody.net/uploads/1/3/0/6/130603955/7646e2d0.pdf
    • http://proctologoenpuebla.com/uploads/1/3/0/5/130589049/nogutisivevip.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_off00007e8f.bin
b067c88137ece39135c4ef1e51fe31bbeb399048f26a76aac15027e829c9d463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8F 8916 bytes

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