Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f63244f30de8ad…

MALICIOUS

PDF

74.2 KB Created: 2021-04-05 10:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a4dbaf10e0d0d277ff3e5445dc78de3 SHA-1: 284d16e740000270496f71f1c159bd65dd78dce7 SHA-256: 55f63244f30de8ad49df8a072f3dce6fba74b4973624708788c58989bd492907
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://zajinet.ru/strik?utm_term=ssr+125+pit+bike+decals PDF link annotation
    • https://mogexeritodomem.weebly.com/uploads/1/3/4/0/134012309/08414c00.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/wexejem-kegejezerop-wefalakato.pdfIn PDF document text
    • https://gewujamagig.weebly.com/uploads/1/3/5/3/135339218/sijufosofeguvozep.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/64e5b7294.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/7529977.pdfIn PDF document text
    • http://sawozuduridab.iblogger.org/dwarf_guide_total_war_warhammer_2.pdfIn PDF document text
    • http://koperorav.iblogger.org/us_navy_dive_and_salvage_school.pdfIn PDF document text
    • https://kikipaniwuno.weebly.com/uploads/1/3/4/7/134714830/5406792.pdfIn PDF document text
    • http://waniwukudalutef.22web.org/interview_questions_on_java_programming_with_answers.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/4653709.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/relukevikogejibekifaj.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/goxajagevaxew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_8f582494c2e343e3a7f9ab0fa8b33335.pdf?index=trueIn PDF document text
    • http://pezidojixu.rf.gd/exception_in_java.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_c82850936b6c4c9a8631b6aa7f571ad1.pdf?index=trueIn PDF document text
    • http://vinegufoxa.rf.gd/de_efteling_park_nl.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_4cb633ae2dfe425a99345a2c39bbe584.pdf?index=trueIn PDF document text
    • http://moxododokojuke.epizy.com/wifevoxisi.pdfIn PDF document text
    • http://vuzonulegi.rf.gd/8453638810.pdfIn PDF document text
    • http://tabewozuzigenog.epizy.com/wubazobufefinogakawegix.pdfIn PDF document text
    • http://vewitemagim.rf.gd/83768447232.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_5f93857ac6c7453b8518647c5b343d1c.pdf?index=trueIn PDF document text
    • http://losaleludaguxes.rf.gd/analog_and_digital_circuits_notes.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_22ebdef606224fd592560c310d565cbd.pdf?index=trueIn 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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 5684 bytes
SHA-256: 6ee20fa9d6368ca99f713d12f3fe4e4bec0f55d514f63e467766104943d41923
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 11528 bytes
SHA-256: b428e8b7690d719793392f8600912555aca8729e24fbc79f804ecfdbdce1d77f