Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b9ddbe14083773…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 21:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 994c4aac4a5a775692c4fdec798fb246 SHA-1: 580fe4cdb886a1f4bcc5db66d9894942d2ef93f4 SHA-256: 83b9ddbe1408377390994473f960340854691778558be9dcfe841ebc7663e522
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=2i4+vs+2i2 PDF link annotation
    • https://cdn.sqhk.co/sifujubagis/sqZSiha/wamasasebis.pdfIn PDF document text
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/jiporemoxef-palovesiga-vajovoxigivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_604079f8bcb84.pdfIn PDF document text
    • https://cdn.sqhk.co/larivowap/4n5kFhi/73805841073.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/gfjihfW/nepal_earthquake_2072_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fe4341b91618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_603fd660a6e88.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/jazzy_select_14_battery_replacement.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fefbe0d61396.pdfIn PDF document text
    • https://firedilem.weebly.com/uploads/1/3/1/4/131407958/loluti-memerepasulawug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_600178c2398e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc7f0aecc6b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5fe2a9192845d.pdfIn PDF document text
    • http://levinorutuw.iblogger.org/ctet_answer_key_2020_paper_2_set_y_download.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/lezudodemosepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_6058b11c61b6a.pdfIn PDF document text
    • http://bejojutota.iblogger.org/gipubejamevadavemuzibefed.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/h8igIPq/lego_marvel_super_heroes_cheats_ps4_deadpool.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magakawigola.epizy.com/90271771911.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/cub_cadet_ltx_1045_deck_parts_diagram.pdfIn PDF document text
    • http://rudolonofuxa.epizy.com/heroes_of_olympus_book_2_audiobook.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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 4524 bytes
SHA-256: c76c2b8d9604e1bb0186418697d5673a58e1e04dabc7b5db2ca458a5e4e9d42f
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 10912 bytes
SHA-256: 5c31c35f3618ed6c693effcf0873851683eb73d4cb46e4b6f66ece14441bf73c

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