Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a64e04fb0c9cd9…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 13:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e08c31a9ccee9ca5d0b4fce49c4e0d09 SHA-1: 79a6c6ad944a404951710ac931e303aaf10d5ad8 SHA-256: a6a64e04fb0c9cd963e3e21f27758f946f7f318cf8c33b44a4b0c57104e8dfe5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=rationality+in+economics+pdf PDF link annotation
    • https://cdn.sqhk.co/vuwonesi/O5jhCUm/slice_dice_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_600a5818bde89.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/jchcgf7/dance_songs_90s_uk.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/novobenagojegefavo.pdfIn PDF document text
    • http://stroy-level.ru/chapter_8_chemistry_study_guide_answer_keywl75a.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/86873355963.pdfIn PDF document text
    • https://cdn.sqhk.co/vizodejo/iiKheic/nabipufepixupuxunuruw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5fca6fcff2ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_60312de4e001f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_60481029a06ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5feba0df817f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_6025e5045a62a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_6010ff656645e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_6030349988747.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/gL1UgdF/one_more_brick_epic_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fd79a21480b2.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/idGjbwl/amc_24_orange_park_endgame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_6004f29f4fd16.pdfIn PDF document text
    • http://shortsomfj.space/disakipujalokataramd4enw.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/69828570293k011v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimarol.myartsonline.com/lomojufo.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/22078648309.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/maplestory_2_maple_guide_ugc.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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 5312 bytes
SHA-256: 5dfbea51ac6a5c474d998da264ce6c4c8f3df78f2f45d31b81b611822bdab417
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 10840 bytes
SHA-256: 008a44dc3ecc2bdea182071fd63f87a68d46f28540abe3765a47d13341d69b78

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