Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44997942f6090aa…

MALICIOUS

PDF

73.5 KB Created: 2021-05-15 03:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a590e93fc9a76b2e3db80c81fc842575 SHA-1: d59cd0b0a7c70097bd88f389e758dcefbc6e0ae4 SHA-256: a44997942f6090aa10748ff7f23ac27b83f77c261a9bcba3590de0c8c08b4ee8
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=reaccion+de+doble+descomposicion+ejemplos+cotidianos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6022a03c5acad.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/dvdvilla_hollywood_dubbed_movies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_6064c92f9f948.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/bRiejis/buregilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/fjgBtgd/zibexowebux.pdfIn PDF document text
    • http://dekabizutetan.22web.org/pamoboguxezavuxofarofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_6035bdb8a0402.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/b8b83e7b-85be-4ad4-a8b9-58316680be0a/history_alive_the_ancient_world_chapter_20.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/jekupuzomuk.pdfIn PDF document text
    • http://jitikatul.rf.gd/72040813287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efb1f47-a2f9-415a-b8d1-60b3944d9c86/the_complete_robot_ebook.pdfIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_f23cf14197da4713929fd5054d200e69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/79270675378.pdfIn PDF document text
    • http://vikalasur.epizy.com/how_to_spell_yeah_as_in_yes.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_4339f97d5ff74dca85bf9668fd30a4b0.pdf?index=trueIn PDF document text
    • http://fewuxujijafefif.epizy.com/das_andere_geschlecht_simone_de_beauvoir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743f2761-b0e1-4604-915a-acc7ef08ddc9/what_is_the_best_gopro_for_snowboarding.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_e4308abfe31f4547ae5e78b2c69d96cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/xivawawojirojer.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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 5344 bytes
SHA-256: ba6e7aded2ab9e25a911f626dd38e242dc15bbb223888856cbdf64fdf8e4afbb
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 11332 bytes
SHA-256: 29adf211e6fd64c93a2d0d74b4c26a745f7d1654fe2e52737bdfb375b9476482

Open this report in the interactive analyzer, or submit your own file for analysis.