Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b089e9643bd636…

MALICIOUS

PDF

83.1 KB Created: 2021-04-16 03:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb5513c51a5f60c94310d0d0cc5281f2 SHA-1: 4a5e93a87e1b9447c0523c4ce3e0b1af9dadefd0 SHA-256: 07b089e9643bd636e3a06765a4fa923663d0a07f9c7565c1c5d2dda0a08a5d6e
244 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The document body, though heavily obfuscated, appears to contain metadata related to its generation, suggesting it's a tool for link farming rather than legitimate content. The primary malicious URL identified is https://dafemum.ru/strik, which is flagged as a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=harry+potter+y+la+orden+del+fenix+salamandra+amazon In PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/750322.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/4617370.pdfIn PDF document text
    • http://nokobefisedo.iblogger.org/nemozidigus.pdfIn PDF document text
    • https://webuxeneme.weebly.com/uploads/1/3/4/3/134368634/9419410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_604ade28925a4.pdfIn PDF document text
    • http://nufudoze.getenjoyment.net/at_home_workouts_without_equipment_for_beginners.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/galuluwesusukesozi.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/amplifier_speaker_matching_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6018cb01405b6.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/xapoziwivakif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_600029fc61a2e.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/de4db8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/79814597.pdfIn PDF document text
    • http://zikorizerijegiv.rf.gd/ielts_general_writing_task_1_answer_sheet.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_2c3ae8b436404456ac3d3f4995cf7c93.pdf?index=trueIn PDF document text
    • http://bujozedaworora.epizy.com/75315937861.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/mimosumudijuregezor.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/what_are_the_four_sundays_in_advent.pdfIn PDF document text
    • http://pabekalu.rf.gd/45921654493.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_cc5158f5d35348eba9811f6bd38d61ce.pdf?index=trueIn PDF document text
    • http://varulorafa.epizy.com/aium_guidelines_ob.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_e0ff808e82fd44f598aa6e4fd7f1e871.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_14a2081e4dff44c7bd1e1ee1c7dcfe31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/game_pool_billiard_online.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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 5368 bytes
SHA-256: fbe9234bd46159f934b6e21fbc5a2222f9178d5007c5e4bfebdf12dcf64d7d1e
font_01_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 12396 bytes
SHA-256: 0518746d0518258cf2376e28b06fbb21bbd69ea6d1e249778fbeaaac7b7ee65b

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