Malicious PDF — malware analysis report

Static analysis result for SHA-256 4425d3e232e8fc30…

MALICIOUS

PDF

82.0 KB Created: 2021-03-29 20:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 548d629ebcbe2eaf96387bb6333d987e SHA-1: 542301382b9f346a65969854af34681697add94b SHA-256: 4425d3e232e8fc30f93bc2b918ac0d374de984eb71f875f86ff5e87f28d2693d
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 0.9997

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://druttle.ru/strik?utm_term=diablo+3+paragon+build+demon+hunter PDF link annotation
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/kobuxisivekipa.pdfIn PDF document text
    • https://nokivuvaxeg.weebly.com/uploads/1/3/4/5/134594014/zugoboxusojimu-xutuxofip-lufimakuwagona.pdfIn PDF document text
    • https://zogudoweno.weebly.com/uploads/1/3/1/6/131637773/ea10aec4fed.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/55015710370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f21b64ff-fa20-49e6-a7eb-e7e09f3ca206/troy_bilt_mower_tb110_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/pawujefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752ae7eb-a8c2-4708-92e3-97f5d3753436/what_workout_burns_most_calories_on_apple_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0795ea-d545-4005-9826-0d67e778ab7c/shark_navigator_swivel_pro_pet_zu51.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/dexivedunaka.pdfIn PDF document text
    • https://676ec9ed-f7fd-49aa-bfd7-c4d7a4ec655a.filesusr.com/ugd/c4f63d_c43534cc76494ed7b9c64ca6331ab01a.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_8524af593e9e44e1b0ea3ad2cacbeb0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/webugu.pdfIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_8d8848ef4f834edfb032d0a08f6a3ba1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/anemia_ferropenica_signos_y_sintomas.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/how_many_carbs_does_nitro_cold_brew_have.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_aa62921b0ba94456a36e7d14e44a5af0.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_7971dc5d61fa43cba81396ed17359e8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4e9934-66d7-46b6-860c-58b78f019184/87897088249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27bdf79-b3c9-4b20-a550-3ecd80941450/elite_rice_cooker_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b694a9a8-41aa-42d4-abd2-0cd8ccea8f8a/34247492305.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 5380 bytes
SHA-256: 21b474a7069b2ac4b892b0131cf934323888aa54705825ea685b968ab4e8ad4d
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10868 bytes
SHA-256: fc728d03503c8b75ffc26783ebf4dd181c857be62fd0302fba966cc106c5a361
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c