Malicious PDF — malware analysis report

Static analysis result for SHA-256 7922c07c03b6ee92…

MALICIOUS

PDF

87.1 KB Created: 2020-04-08 14:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38c9875b7d57e6304818ee0791664e05 SHA-1: 94bd9475d490ecff65da3d38e7be53c8b5462170 SHA-256: 7922c07c03b6ee9253118f56be9864c1cd1a15a596190ea913a8a1fbebce7ce3
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 to various domains, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The embedded document body text is heavily obfuscated, preventing a clear understanding of its direct purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://victoriastephens.net/uploads/1/3/0/6/130639534/130639534.html#works+and+days+best+translation
    • http://hmestrategia.com/uploads/1/3/0/8/130814290/27f63cf10d352.pdf
    • http://lcosmetics.net/uploads/1/3/1/4/131407493/larefen-satizagiku-zonitiv.pdf
    • http://multiplesclerosisdocumentary.com/uploads/1/3/0/7/130738723/xedewidineg.pdf
    • http://penniesinyourpocket.com/uploads/1/3/0/4/130483364/sutobajiton.pdf
    • http://vinnysworkshopgoods.com/uploads/1/3/0/7/130739690/xawup.pdf
    • http://transatlanticlg.com/uploads/1/3/0/5/130588834/63236cab69.pdf
    • http://funnykidgame.com/uploads/1/3/0/7/130740049/3f80c25f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b33.bin
23595c296014ccf5e794e35b183fdf368072529d541c891a132888c5f3a0cdba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 8288 bytes
font_01_sfnt_off00013aba.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 16036 bytes

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