Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ec87ff343e84aa…

MALICIOUS

PDF

82.4 KB Created: 2021-04-23 18:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a2b7a31c2f27587d27c9856ddf3235e0 SHA-1: 1f72331c293638d12e4adc9391621ca8bdd9f948 SHA-256: 79ec87ff343e84aa6da64c39ee80254287b3e0a04a4061d6141de4b42e4373b7
186 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 0.9993

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=toyota+camry+owners+manual+2007 PDF link annotation
    • https://cdn.sqhk.co/fogunivugame/fOzoiie/31582510573.pdfIn PDF document text
    • https://cdn.sqhk.co/falunibesedo/idifRgi/war_during_mughal_empire.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/crpc_bare_act_book.pdfIn PDF document text
    • http://rorureferujuraf.22web.org/spanish_speaking_countries_and_capitals_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/ZnRhdHu/xobaraxopidesunuz.pdfIn PDF document text
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/dagofebalojegofelu.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/ohilnsQ/gejizipeju.pdfIn PDF document text
    • https://zuxijonimobazi.weebly.com/uploads/1/3/5/3/135351106/judifusivogav-jomevebosediwet-xawazuteler-tiwepimenekig.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/maxajedowuvevikapa.pdfIn PDF document text
    • http://rotarovew.22web.org/84599596226.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/24936789346.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/cN3jaje/brick_images_hd_png.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8bf274-1007-402e-8d92-0346609e48ae/how_much_does_10_minutes_of_jump_rope_burn.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_48a1cf708d2847e8a75e71ee932ba507.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2bf234-167e-416e-b5ac-1d192f1d3b33/us_history_quiz_questions_and_answers.pdfIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_68672b0856484fa09c5926506898aa04.pdf?index=trueIn PDF document text
    • https://8e2462c3-2f66-48cb-9487-448a5f38467c.filesusr.com/ugd/c345b0_03058290b32b4147b9a78c1708499882.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fcf0ed7-4340-4389-bf90-812615520437/tales_from_the_loop_rpg_download.pdfIn PDF document text
    • http://manepiri.epizy.com/hp_designjet_500_42-in_roll_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fb4169-1e7d-49de-a1bb-08d8db51951a/kutuxuzuwozibatimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c5a29a-13b1-4d07-bc6e-d9bcbdebc98c/gobabalixef.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_55ef3aee1477406fbae0d2ef7490f5db.pdf?index=trueIn PDF document text
    • http://sozizuw.rf.gd/button_wala_mobile_mein_game.pdfIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_33572cc247ee4b15995eee9b01303064.pdf?index=trueIn PDF document text
    • http://nenunosulijud.rf.gd/nulegenaz.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_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 5440 bytes
SHA-256: dd00c2647592602edae7596fff176b4b47a2c8c2ce30a4b70487411d7cfb7398
font_01_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 10768 bytes
SHA-256: 209b79b75b55e5bb82b0804e4a272030bcffc864bd0878e87b2adcb65368cb7c