Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a51ac9f8a790fa…

MALICIOUS

PDF

83.5 KB Created: 2021-04-04 13:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 17975f95295bd0f0608f9ce0ecd8dc1e SHA-1: db155ae52fab77721a86ec6e019640072524ad6d SHA-256: 84a51ac9f8a790fa4fd1044c1f50ec7068ef0068dcdb35a65e43bd02ac0fbd42
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially leading to further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://fokemale.ru/wix?keyword=aiag%2527s+fmea+manual+4th+edition+free+download PDF link annotation
    • http://babitilakibo.mywebcommunity.org/meperowoligix.pdfIn PDF document text
    • http://gosufogirepejam.22web.org/wewojen.pdfIn PDF document text
    • http://bodulotol.22web.org/lo_que_no_te_mata_te_hace_mas_fuerte_libro.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/nowip.pdfIn PDF document text
    • http://mijakaku.iblogger.org/94418496361.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/22803ca6-7d16-4e37-ad0c-fee53f7f071c/vukoluboziwakotebikavezej.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_45587e8b46934ee8a16d018be4394f1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9bcfda-95dc-4344-809d-2d3e9f99970c/4186483426.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_1fc5cca15bb7431faf964cfa0af22e87.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_cfb31fedb9b04947bbcd0324e369c087.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/wuwelevubepopu.pdfIn PDF document text
    • http://dofagubixipo.rf.gd/46821788110.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/bissell_proheat_2x_revolution_pet_pro_upholstery_tool_not_spraying.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/appserv_2._5_10_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b774abf7-7f1c-4dcc-ad4b-9f6ec21170ab/94118746503.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/calfresh_income_guidelines_2018_california.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_f6fedb3628a84f53b29cab2b9107ae4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88f2505-47cb-4c6a-a59d-650f021fa679/77516521636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69715802-ad2c-458b-b963-dbee013e7f4a/junajuritapobupovasoxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f92e89-4d9c-41dc-b7da-adae00840323/vuseretidunajiniba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5c4a91-3acf-4f45-b9bf-3b73c70be7a7/written_in_my_own_hearts_blood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5277a285-7cbd-4af8-a658-95269ca696d6/david_rockefeller_memoirs.pdfIn PDF document text
    • https://b5f62e6e-b620-4b0e-90dd-fa81fc7fb5c2.filesusr.com/ugd/18d815_9bb9b7ac48bd426cb9e2900e558836db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfa75cf-c27b-4b54-9645-555cb083b9c6/tomojetexobirejupojadituk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 5524 bytes
SHA-256: d028482ed7a6eb201ace1ab118cb274d54f3956c8b2701c0e65debdac5595ce4
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 14844 bytes
SHA-256: b97b7cf65e21e77bf93704bfa30d4dec2ad3d69c1df61bd730868c312a7d62ae
font_02_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 18500 bytes
SHA-256: b70917c2d49a4d234e109b8ae1477fa5d5b1a3c85d803d1a4dc7a775cb1258c9

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