Malicious PDF — malware analysis report

Static analysis result for SHA-256 e891173ff5928e56…

MALICIOUS

PDF

65.5 KB Created: 2021-02-23 19:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 04136c3f231f608dec466ebf4f025528 SHA-1: 84816d3bcbfcd870d9581e112524e621d120278d SHA-256: e891173ff5928e56dd66bb861d0811bc9ec76547e79370350ecda5e4bbd1b0d1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. One prominent URL, 'https://bologen.ru/wb?keyword=aws%20cwi%20test%20questions', suggests a potential lure related to AWS CWI test questions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://bologen.ru/wb?keyword=aws%20cwi%20test%20questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6025b121071c8.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/IU99Ehd/download_driving_school_3d_2017_mod_apk.pdfIn PDF document text
    • http://gelchlen.fun/644996046445k9r0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fd32062e5dfe.pdfIn PDF document text
    • http://vivadoctor.ru/takerasazulasiw10arj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fcb142d876f4.pdfIn PDF document text
    • http://eurozone.pro/96343818213puqo2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6028a0895a0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_6017f71f71c3b.pdfIn PDF document text
    • http://healsmall.space/a_thousand_years_christina_perri_mp3_downloadsmwwg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezetega/treating_coliform_infection.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/4e_monster_manual_2.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/adding_and_subtracting_integers_worksheet_math_aids.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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 4664 bytes
SHA-256: 694353444bff44eb5cfabfd0294adb446ec02b99fd6877dcb3affc061eb072fb
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 10416 bytes
SHA-256: 2e0278df828d10db1e081681eca76d6cf0e5556746a50b54cce76f90262d8414

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