Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3b6de29a23b12a…

MALICIOUS

PDF

92.6 KB Created: 2021-01-08 03:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3800228c8b85bd1aa52d6644f20ca90 SHA-1: 7e1dceabf79ed5df1d6999f0cf50b368fd8e949c SHA-256: 2f3b6de29a23b12adf6d4ff86d6156ea1d14ea97307fde4ad6c5b75bbd093543
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and a remote-support tool lure, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://traffnew.ru/123?utm_term=capism+tutorial+answers
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5fd79083ad54b.pdf
    • https://xejukogafowoje.weebly.com/uploads/1/3/2/6/132682905/gikomodorofusosepo.pdf
    • https://cdn.sqhk.co/dosijowikul/igEjiie/21100280482.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5f8cb89f83622.pdf
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/623721.pdf
    • https://cdn.sqhk.co/sawapevodef/ijhjibC/image_editor_online_free_no_download.pdf
    • https://cdn.sqhk.co/nomazotesi/FkZEjeD/starlink_battle_for_atlas_2_player_switch.pdf
    • https://cdn.sqhk.co/pelotuwew/t5JijwN/51666066562.pdf
    • https://cdn.sqhk.co/zupuguvawaj/eigieii/ninja_foodi_air_fryer_recipes_chicken.pdf
    • https://cdn.sqhk.co/wavagowew/OQVshdJ/battle_angel_alita_last_order_omnibus_1.pdf
    • https://cdn.sqhk.co/mekaxosur/jgsQjf6/28116557683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pizivurapab/boporofonepopuruk.pdf
    • https://s3.amazonaws.com/timeziso/21799030658.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/lung_cancer_guidelines_canada.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/68834688904.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dab.bin
4edb9068643c5c527bef3b0e91f676372c1f7fedd4221fad9d03bddb1c23a2f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 4964 bytes
font_01_sfnt_off00013e7d.bin
81cfaf1cf33d49324d559efb37f33fe7568a6f7114df99cc9d3a3405c0d046f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 11460 bytes