Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e6cf83667e1f5e…

MALICIOUS

PDF

73.4 KB Created: 2021-03-19 23:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47fcbc49b3ba8ab6b4dae33fad74fd1a SHA-1: c57ce3f75f22971f2debebb3e697521a2cc395a8 SHA-256: a9e6cf83667e1f5e22907c5daf156fd095007d54c37030c08330a7aa484f8b97
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://jacksth.ru/wix?keyword=fruit+from+a+poisonous+tree+book+pdf PDF link annotation
    • https://cdn.sqhk.co/gadujotev/hbgihfv/zunorumegelenixemiredupok.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/gOiemia/super_spaceman_world_of_warcraft.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/cfdc28.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/rjdiivp/gatefetuzoda.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/gchagjh/fuwuvuronejefasoda.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/ejocLxt/xubiwokevigufobak.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/iYtC3Qx/buginusisul.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/EhfNqhe/pathfinder_cold_iron_masterwork_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/dchi9cw/highway_closures_due_to_fires.pdfIn PDF document text
    • https://cdn.sqhk.co/domuzusud/g5UPzib/43304653447.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/aiet9aD/can_a_non_catholic_christian_be_a_godparent.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/kpz8Fhf/tunafuvugugebenapot.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/ihetjiZ/tozitupavasejasemedosef.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/haiht6P/snake_color_rhyme.pdfIn PDF document text
    • https://bazanepuxakelu.weebly.com/uploads/1/3/4/3/134346533/5457107.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/6597362041.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/60556726592.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/77295528885.pdfIn PDF document text
    • http://tirixerunifadi.rf.gd/before_i_wake_sub_indo.pdfIn PDF document text
    • http://vanepozimor.rf.gd/the_paper_bag_princess_interactive_read_aloud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 5312 bytes
SHA-256: 7dc7253d3afd415405447cb8f9926db8a8bb128f26cd23d19d219c47ed2fe09f
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10616 bytes
SHA-256: 85b4917ca7c401c3931a1ead01ded104a5cc71f3628c9a6606edef0fba43746d

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