Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb2fd137231bdfa…

MALICIOUS

PDF

42.0 KB Created: 2020-03-06 15:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ff96d6ac1d8edb1909e9dd24dcd255f SHA-1: 48bea703fd5c282b451addeeb3ec0bed149700cd SHA-256: 3cb2fd137231bdfa44fde0179b9fb48fcadfe68a9524d4c62916613722767462
94 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam campaign. The document body text, though partially corrupted, includes a URL that mimics a file conversion service, likely intended to deceive users into visiting the linked sites. The ML classifier strongly indicated 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://beyondbeliefthebook.com/uploads/1/3/0/2/130271132/130271132.html#online+scanned+pdf+to+editable+word
    • http://www.vpn.garnerfritsche.com/uploads/1/3/0/6/130604394/vokexixugof.pdf
    • http://www.goldendaysfarm.com/uploads/1/3/0/8/130874220/josarega_desumepukiw.pdf
    • http://www.thepipecorner.com/uploads/1/3/0/6/130621584/179519fae2.pdf
    • http://gle-services.com/uploads/1/3/0/4/130476880/lerifubep.pdf
    • http://giantexports.com/uploads/1/3/0/2/130289096/a07fa15b3.pdf
    • http://southsidetower.org/uploads/1/3/0/6/130603745/safujesojof.pdf
    • http://aquariumempire.com/uploads/1/3/0/5/130551174/5287534.pdf
    • http://motexplusglobalsolution.com/uploads/1/3/0/6/130620443/0537ea8c.pdf
    • http://9f60dnj005.com/uploads/1/3/0/7/130740196/mubamebirefetit_redopum_reludipi.pdf
    • http://tracevilab.com/uploads/1/3/0/2/130288592/gedafenejoxadutoger.pdf
    • http://chicagobaseballacademy.com/uploads/1/3/0/6/130639481/medufekujozibi-wizoxezizonub.pdf
    • http://feilvbinbaijialemianfeishiwan.br3h.com/uploads/1/3/0/9/130969076/4386229.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_off00005ed6.bin
b6d6e917195421d41d42b52092f127ec96b1ceb3d42b8ff7ddb067979613855b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 10988 bytes
font_01_sfnt_off000085e7.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E7 16036 bytes

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