Malicious PDF — malware analysis report

Static analysis result for SHA-256 70575a157b02821d…

MALICIOUS

PDF

38.0 KB Created: 2020-04-13 03:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d2d777c38d1bfe171ef781fb34baae70 SHA-1: b8b5ae3340d5546137d597e2ebd191b05decde9e SHA-256: 70575a157b02821dbc38ac4bcf3ce649eeb07381bcc2e1905511cd1125cb039e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to serve as a dropper for further malware. No scripts were extracted, but the heuristic firings and embedded URLs point to a social engineering lure to drive traffic to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-8941339-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8941339-0
  • 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://nicevirginhair.net/uploads/1/3/1/6/131606047/131606047.html#office+cookie+bake+off+rules
    • http://allisonmilmoe.com/uploads/1/3/0/3/130324136/kelusudisiwupu.pdf
    • http://harmoneyezvisions.com/uploads/1/3/1/3/131380212/7899499.pdf
    • http://hannabasinmuseum.org/uploads/1/3/0/4/130435753/7d0e1.pdf
    • http://kimevansmft.com/uploads/1/3/0/4/130476271/717e550ccd95db.pdf
    • http://northwalesvwt5.club/uploads/1/3/1/4/131453348/ecc300de1c.pdf
    • http://annnamusic.com/uploads/1/3/0/4/130436202/fatanaxiwo.pdf
    • http://soulonthego.net/uploads/1/3/0/7/130776264/fitejoxozadokov.pdf
    • http://probuscurrimundi.com/uploads/1/3/0/6/130605306/5763552.pdf
    • http://dansationfitness.com/uploads/1/3/0/6/130639045/864906.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_off00006ba9.bin
9038a5e90f771a6276c0166bf338bf86c44192ce3c4839d9985d144acb26886c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA9 8032 bytes

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