Malicious PDF — malware analysis report

Static analysis result for SHA-256 d640770ec067d968…

MALICIOUS

PDF

73.6 KB Created: 2021-06-08 20:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6065d1cd7811ea1f349348f49960dea2 SHA-1: 2a22a5cbdc4cf948e97e1c2b3cbf7fb3beaf55ec SHA-256: d640770ec067d968294632eba0e1b4bee1535a8d41ee51edc2461498ff551ade
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 0.9991

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
  • 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://archism.ru/pbw?utm_term=unlock+mtool+free+download PDF link annotation
    • https://madoxeviwijiri.weebly.com/uploads/1/3/4/4/134475969/db25caf.pdfIn PDF document text
    • https://figedojopijobe.weebly.com/uploads/1/3/4/7/134769561/2176245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_60505fec561cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5ff52eead4034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_602cb01373597.pdfIn PDF document text
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/wosezor.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481828/normal_60b46a6d5880b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_5fe1c46296ea8.pdfIn PDF document text
    • https://lozofedexipa.weebly.com/uploads/1/3/5/9/135969573/5703623.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/a15639e80dd4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5fde3f2e54717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_6054bf46a8865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_602162d0310ad.pdfIn PDF document text
    • https://tomutoremaduv.weebly.com/uploads/1/3/1/3/131398477/zekobobagis_rigukeg_lazekuxe.pdfIn PDF document text
    • https://bovagisobupuzod.weebly.com/uploads/1/3/1/0/131070774/negeparobop.pdfIn PDF document text
    • https://fixupusojorulu.weebly.com/uploads/1/3/4/4/134438709/xiwesosijel.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/a9b2da80-77ff-4743-bf8f-239f583cf585/the_ultimate_guide_to_body_recomposition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7147cfdc-9306-47da-a5db-edc085f14349/fixenizitepi.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/w/file/fetch/144698391/reactions_of_acids_with_metals_worksheet_4.5.1_answers.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/w/file/fetch/144778827/pikolodilirepubedi.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/libro_aprendiendo_de_los_mejores_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a361446-4f93-4efb-83b8-bc0dd4267b2e/do_all_air_purifiers_need_filters.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144445164/how_many_calories_in_1_ground_beef_taco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab619222-7fa8-4e19-87e1-031e6cae8cc1/ged_social_studies_practice_test_2020.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144520587/sram_guide_r_brake_problems.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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 5136 bytes
SHA-256: 15cdc7ce8cc0b44d4cf6666c98fa8774cd85d4d97cebfaad923c0afbe86ce35f
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 10684 bytes
SHA-256: 929f184df511eb5751746a040f035be864dbee8653f3a5313817cbac1e0fbf67