Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f73812aa473d9e…

MALICIOUS

PDF

82.1 KB Created: 2021-05-14 08:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8ffdf5d2da6154936e3b57d701095d53 SHA-1: 646c62670b3cb567e103ea109c8fcb02cbb661bb SHA-256: 20f73812aa473d9e3463bba6992486af3e7ae468c3b72aaf24efec629ec0958d
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute traffic or potentially host malicious content. The primary URL, 'https://resalured.ru/strik?utm_term=how+to+make+white+garlic+sauce+for+pizza', suggests a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://resalured.ru/strik?utm_term=how+to+make+white+garlic+sauce+for+pizza PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60152f6a506a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_606995782ae9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5ffcab94ec0d2.pdfIn PDF document text
    • http://nakomajuvedina.iblogger.org/the_little_prince_movie_best_quotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_6027cedce63c9.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/jbygjic/56731682299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_6018bb968a5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_6064c69daddb1.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/hjlL0ec/connie_walker_pac.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/ihibZG1/4105340278.pdfIn PDF document text
    • https://cdn.sqhk.co/rowibimibopi/ifPcjj5/84246015745.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/Vhdxii3/fashion_girl_dog_names_that_start_with_m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_60110e844d5c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5ffe886a7dacd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5ffb68bfe2860.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://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_db02d0ae22dc4251a60c72716f0ea491.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/929f0381-968a-44a4-849c-1abae30b708f/wagimorokupevufominip.pdfIn PDF document text
    • http://notaruk.rf.gd/julexalubexeretigini.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_8a54a15a04604f50a377e2793fd7c498.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_3cfcfaa048de40ebb60a2dad0271b9de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ee25fc-15c3-492e-89b4-9da4c59086b4/do_colleges_accept_weighted_gpa.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_895bb68458cd4f40b2304e102b7ee7d8.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_6916138625744e03a2a2b0b57d649f0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ce26bd-a039-483a-ac62-7847799df4e7/74151236992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ef83ce-f4db-42f0-a6cc-1931887a92e8/81782450596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f1cac9-ddc4-484a-aed3-6c6539d8748d/42988235298.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_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5372 bytes
SHA-256: 0863b1036d658c271911e21a464a547b14801d698598a720045959866fb99f84
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 11624 bytes
SHA-256: edcd72e0c56f05d3a031557105bd6758b6999bf4233d2ca34084c6967fc01c86
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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