Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be1164dfdf46544…

MALICIOUS

PDF

41.9 KB Created: 2020-06-02 12:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca9bfae916e0cfab8c7f3a4964150a2 SHA-1: c054215c0cfe196da22559239de2d01fe2309aa2 SHA-256: 3be1164dfdf46544d7ee4d0335fa884bed714519cbad7ff48ce62051b0a06af7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary function appears to be redirecting users to a network of external resources.

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://ivoryandoak.org/uploads/1/3/0/4/130483368/130483368.html#alexander+amador+caldera+salas
    • http://kellysconcession.com/uploads/1/3/1/4/131409621/9708d.pdf
    • http://chopshopsaladshop.com/uploads/1/3/0/6/130621610/229422e.pdf
    • http://praiseassembly.com/uploads/1/3/1/0/131071019/komokotig_dojavine_nikebematutoj_xilawalut.pdf
    • http://franksteinstudio.com/uploads/1/3/0/8/130814110/mewusepegoju_zavekakarelos.pdf
    • http://thenational-125sclark.com/uploads/1/3/1/4/131407226/624509.pdf
    • http://mail.upholsterydave.com/uploads/1/3/0/4/130476205/2097766.pdf
    • http://derecom.biz/uploads/1/3/0/6/130621301/varudakotereni_pakeminegu_pisuwujeraz_zofedojupewe.pdf
    • http://katherinesiu.com/uploads/1/3/0/5/130551944/ritobomakuvi.pdf
    • http://meaghansnursingportfolio.com/uploads/1/3/0/4/130436074/mukumudomozugenezab.pdf
    • http://ivoryandoak.org/uploads/1/3/0/4/130483368/terms.html
    • http://ivoryandoak.org/uploads/1/3/0/4/130483368/dmca.html
    • http://ivoryandoak.org/uploads/1/3/0/4/130483368/policy.html
    • https://fubosadu.files.wordpress.com/2020/05/16615325872.pdf
    • https://texemixe.files.wordpress.com/2020/05/vuwarotefudilusutazexumok.pdf
    • https://guwunib.files.wordpress.com/2020/05/jurigaxibevoluvadetuzivot.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_off0000745a.bin
edcbd63be64160cf5b13964d4cdade251eda6c218466459356e55e513c7bb023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 11684 bytes

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