Malicious PDF — malware analysis report

Static analysis result for SHA-256 94245e3e3268e5fb…

MALICIOUS

PDF

38.4 KB Created: 2020-03-26 05:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbde73f92b54d6b8e3ae546fc7790476 SHA-1: bb6b09241a79582aaa711be8a9e7dc830047f683 SHA-256: 94245e3e3268e5fb51f5f0b8c842cadb0782925541431fadef2c794de51f79b3
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains with numeric or generic slugs, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary purpose appears to be redirecting users to potentially malicious or unwanted content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8377496-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8377496-0
  • 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://acouturelife.com/uploads/1/3/0/7/130738666/130738666.html#nikon+riflehunter+550+rangefinder+reviews
    • http://fuck366.space/uploads/1/3/0/4/130436141/498022.pdf
    • http://elliott-wright.com/uploads/1/3/0/5/130589178/pedotibipa.pdf
    • http://ninjaproxies.org/uploads/1/3/0/3/130379371/nifimat.pdf
    • http://traditionalcatholiclife.com/uploads/1/3/0/6/130603995/5203d2127fb59.pdf
    • http://mysticislenurtures.com/uploads/1/3/0/2/130288380/8437892.pdf
    • http://bsuitedbybrandi.com/uploads/1/3/0/6/130620387/fujonajipuwogof_wepejokamogepal.pdf
    • http://getsignedrecruiting.com/uploads/1/3/0/6/130621607/202addedc8107.pdf
    • http://benplimpton.com/uploads/1/3/0/5/130544954/7976194.pdf
    • http://paperheartsandmore.com/uploads/1/3/0/5/130540559/9067223.pdf
    • http://abcdts.store/uploads/1/3/0/7/130774979/naratu.pdf
    • http://okcherpsociety.com/uploads/1/3/0/4/130476496/kusewajaka.pdf
    • http://bellatoons.com/uploads/1/3/0/5/130551726/logagegel_tesafifazovako.pdf
    • http://diamondeventcenterllc.com/uploads/1/3/0/4/130435578/zezeza-pozatubar-sabafonipovij-gusikobexiratuw.pdf
    • http://dieseldocdenver.com/uploads/1/3/0/2/130287862/b706027de1.pdf
    • http://jazzybobbins.com/uploads/1/3/0/4/130483678/48c3069f6aad7.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_off00006b77.bin
e0b124458cef6c86d64d0e17f2f9dcbe426024ec164df0dccc7d1a995d8fb7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B77 7944 bytes

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