Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5c4d5d85c6b33b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 23:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fdf6265ce110330354fdc856020bd79c SHA-1: c64b48f431e78d090338d5876574a73b4239bcc1 SHA-256: 6b5c4d5d85c6b33b5e85b3772445ba71d385b144858367b0a60d6daea9ac5680
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://pelibifir.ru/wix?keyword=florence+sc+tv+channels, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=florence+sc+tv+channels PDF link annotation
    • http://bexunorisomev.iblogger.org/36505772760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_605050e8de8a7.pdfIn PDF document text
    • http://tobazoduto.22web.org/south_african_biscuit_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375503/normal_5febc56106db6.pdfIn PDF document text
    • http://difavusimope.iblogger.org/96546120610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_6047f119c6082.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/649d991d-80a6-4c1b-bc26-d3cecb97c640/dirujexasutoxixabifatiw.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/filtrete_3m_thermostat_battery_replacement.pdfIn PDF document text
    • http://wasamatebupo.rf.gd/95808918126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87cd340-f33f-4ce3-96f2-94c90c1041d9/lizatukamivowupev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bfdee3-5c2f-4022-a9f0-81a6cbc8c9e6/introduction_to_computers_questions.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_75959dcaee214beeae35903dc73d7e7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/wepel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfaed59c-dab8-43ad-9828-2000f3aee506/bradley_smoker_4-rack_digital_electric_smoker_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/workitect_competency_development_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/baby_kissing_photos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/icse_class_3_maths_book_free_download.pdfIn PDF document text
    • http://putojoner.rf.gd/46969775058.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_2c0982d58d2b4ee5bb249af8ea424479.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66406bca-deeb-44d1-a5e7-18723b49f592/ditepexuvuzamobikekepow.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_e2ca6a3837e0465fa099ba39fce3e72a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2f3519-91c2-496f-ba4c-5425dd0db705/online_games_to_play_with_multiple_friends_on_different_computers.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 4900 bytes
SHA-256: 5d12b852ddc6fc9ec5aa881a7c618af378f735194f8aed56399eb5c1e22e31fe
font_01_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 10492 bytes
SHA-256: 6e7ed54dd967206e22466ee0c929ff900c52f4e9de3654a60edbb370591367f7