Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dff441562cde559…

MALICIOUS

PDF

39.8 KB Created: 2020-03-29 02:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4a0e7529e7ab5b6750409033c23cf530 SHA-1: 79b4013c0b8c452012029b6f6cb4b329988e4a27 SHA-256: 5dff441562cde55982bca43fc30b06b6dc17803cccaa4a1aa26c62246706c7da
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, disguised with a 'Schwinn 240 exercise bike manual' title. The PDF_SEO_LINK_FARM heuristic indicates a large number of these links, suggesting a link farm or SEO spam campaign. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious or spam content via embedded URLs.

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://zambiasafarihunting.com/uploads/1/3/0/5/130539774/130539774.html#schwinn+240+exercise+bike+manual
    • http://launchachurch.org/uploads/1/3/0/7/130740123/9003472.pdf
    • http://ifchampaign.com/uploads/1/3/1/0/131071164/lekovepo-mofemiwo-lubaw-jafovisefobaki.pdf
    • http://thinkactionplay.com/uploads/1/3/0/5/130588749/8370723.pdf
    • http://testimonials.chrisbikes.co.uk/uploads/1/3/1/0/131070710/tuxosoxifogaruro.pdf
    • http://khatibenergy.com/uploads/1/3/0/8/130813992/muferesuxix.pdf
    • http://centralpaeoe.com/uploads/1/3/0/8/130814078/jibetera.pdf
    • http://goodnightvodka.com/uploads/1/3/0/6/130604689/ledobis.pdf
    • http://newmilfordpilates.com/uploads/1/3/0/5/130550742/2196521.pdf
    • http://tomsfood.com/uploads/1/3/0/6/130604527/lojokibidimuni.pdf
    • http://simplygreenhomeservices.com/uploads/1/3/0/6/130604040/e05245e1a90ce00.pdf
    • http://strategicanswer.com/uploads/1/3/0/2/130288722/xazuromupi-katipapetaworeb-lowamodagu-dugituvutuxuxug.pdf
    • http://lukesheatingandcooling.com/uploads/1/3/0/7/130738625/7933029.pdf
    • http://richardsnashall.net/uploads/1/3/0/5/130544384/82103f.pdf
    • http://sweetsbysamie.com/uploads/1/3/0/2/130271207/jevapidadoji.pdf
    • http://help2u.net/uploads/1/3/0/7/130775021/pujere.pdf
    • http://fitcoresmartmoves.com/uploads/1/3/0/6/130604678/7403535.pdf
    • http://xtremepressclean.com/uploads/1/3/0/3/130313564/sozonanagewi.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_off00007629.bin
bde16e595e4b22cf61c25dbc26677c942bd664a6683b3b2c648b8c34e568b0f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7629 7068 bytes