Malicious PDF — malware analysis report

Static analysis result for SHA-256 742c840a74dddcd5…

MALICIOUS

PDF

83.5 KB Created: 2021-03-24 15:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1771cc0e26e8b80b0d48b018a44623f6 SHA-1: 9d0494356478fc4f8485d86f001dc4d3111bd290 SHA-256: 742c840a74dddcd5666f40400d1c7042023f6edc81cb37aa5b3c4d5653739de0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, https://mezovuduw.ru/award?keyword=gym+routine+for+weight+loss+and+toning+pdf, suggests a lure to a malicious website. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mezovuduw.ru/award?keyword=gym+routine+for+weight+loss+and+toning+pdf
    • http://apparentlyopt.com/send_in_the_clowns_free_sheet_musicclekm.pdf
    • https://cdn.sqhk.co/rujiwujik/JieoggY/56755984728.pdf
    • https://cdn.sqhk.co/mawodoso/3hdyjdu/21136066263.pdf
    • http://raifaisentgo.online/kifigimebosujigesol8qin5.pdf
    • https://cdn.sqhk.co/bujavenizake/RD35jF5/xovoguvunuvewifub.pdf
    • http://moitender.org/63906203928573qb.pdf
    • https://cdn.sqhk.co/tajiwikiter/XgckTjc/business_kings_cigarettes.pdf
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/rasigap-fevofipufozevi-rurejo.pdf
    • https://wetikifavuzimol.weebly.com/uploads/1/3/1/6/131606122/dadbc.pdf
    • https://cdn.sqhk.co/safubuguva/R0D7Rjf/tufutegir.pdf
    • https://cdn.sqhk.co/xorudonox/yVjfTia/69319560067.pdf
    • https://cdn.sqhk.co/xubupigegi/gim6jfJ/rogabosemu.pdf
    • https://vutitikanok.weebly.com/uploads/1/3/4/7/134774074/8433755.pdf
    • http://cabinetsop.xyz/zimsec_a_level_biology_past_exam_papers1vzbg.pdf
    • https://cdn.sqhk.co/kesusevuzep/nTHdKy9/hypertension_guidelines_australia_racgp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_5aa24fb0f9aa4e6b913f9e3d364586b5.pdf?index=true
    • https://s3.amazonaws.com/jenagubadopi/11029385111.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_5c8f4d362224422293f47f5e30d93325.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_583412ce1db8454384ed66e581aea37e.pdf?index=true
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_26e821677ec7475a8659fb61a9aac562.pdf?index=true
    • https://s3.amazonaws.com/vabemavuputenif/gatuvotalomevejolodo.pdf
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_59c536a6a8494a96a80dff9d2e588c46.pdf?index=true
    • 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_off000107fb.bin
896d6e189f0704e64a4b5cb43014582e6baa1d079cd4b4ac4065a0a2e93c621d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 5680 bytes
font_01_sfnt_off00011b45.bin
f4c9ad70ee9695d642d70c817a61783be0f31827e024598d3ea88077c2d412b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 10732 bytes

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