Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc998c3f6ce25a2…

MALICIOUS

PDF

69.2 KB Created: 2020-12-02 20:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6750ca3b78cb5f4caeb7dbb9a0aef33b SHA-1: 9cdb63b9e6deb1464d6e30f1fc5b49bedfd98690 SHA-256: 4dc998c3f6ce25a2f6c73a764de27ed2616ee9b98f2f5577bfee3469722205cf
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new payment instructions, a hallmark of business email compromise scams. ClamAV detection and ML classification further support its malicious nature, pointing towards a phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://trafffe.ru/123?utm_term=uphill+rush+unblocked+66 PDF link annotation
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/7050f7401.pdfIn PDF document text
    • https://xizodekez.weebly.com/uploads/1/3/4/7/134769153/fexolagirenumoxinuje.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e85027a199023ab5619d/t/5fc15ac74f9837572012227a/1606507207704/zakuxaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c1fef9866f3fd2da6514/t/5fc721e95060c93fcd775568/1606885867092/likisufofus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a3b8d3-9893-4884-870b-65c59e88e42b/physiology_of_behavior_10th_edition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ca4260f2895dc1e74bd4/t/5fc401f76457125654b83e98/1606681079633/bomb_it_2_multiplayer.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/80173933797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8539d5a3-8c40-4072-a521-b12caae9e45a/comprension_lectora_para_nios_de_primaria.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ca93485235c86bdd4af/1606376626086/laredalelawak.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6092e537a05ef08bc6e/t/5fc78accb7521d608a492562/1606912717759/93950471094.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 3544 bytes
SHA-256: a9e49a46545fe3c327ee2a9e97f1b3e1867db94ff766e69521c1ba1bdde88281
font_01_sfnt_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5300 bytes
SHA-256: 5c8221962b5e9144f673fe46a6057a90b829233b67a8e985ea4bd7bc73e18652
font_02_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 10348 bytes
SHA-256: 1260ba43efb14130dbff30035a35edd181de617126a763d15a077d81fbfe08ad

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