Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0748b1e818589f…

MALICIOUS

PDF

76.0 KB Created: 2021-04-16 06:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ac8315edc3e2421385b4010500112aaf SHA-1: f8e12e87d7800c831fd5844c5a0167de2f536900 SHA-256: ae0748b1e818589f9d7c17d802541b21fec47eb908e4bb137ffa731e638726f3
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, with one prominent URL being https://pelibifir.ru/strik?utm_term=explode+the+code+online+vs+workbook. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=explode+the+code+online+vs+workbook PDF link annotation
    • https://cdn.sqhk.co/xaxovowupofa/sfW4ggS/pov_car_driving_apk_hile_indir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5ff33d3d0176e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5fdc666897e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_60411c7da188a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_6021271711bee.pdfIn PDF document text
    • http://piwakere.iblogger.org/tezejexedelupavel.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/Ncjghiz/30_day_workout_challenge_at_home_for_beginners.pdfIn PDF document text
    • http://kupivse.xyz/bejijowenosoxowizhjpht.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5ff092910e7d7.pdfIn PDF document text
    • http://losinglotterynumbers.com/85916784178iuo4q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_60524a65cec6a.pdfIn PDF document text
    • https://cdn.sqhk.co/bobofibu/giic4o7/46620417112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5fdf7ab279d5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_7a7565060eee4b8d9c0335cdc0099cbf.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_ce1ec5bc34a143ada407d38f6c9bc83a.pdf?index=trueIn PDF document text
    • http://pitefabe.epizy.com/93923081640.pdfIn PDF document text
    • https://fdddb917-2277-4030-bd88-331cad456ef8.filesusr.com/ugd/f34323_b2b463eadf1d4f8a8cb69614f80f2752.pdf?index=trueIn PDF document text
    • http://bidupoxamejab.epizy.com/weight_lifting_guide_for_beginners.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_4c0f8f6ba7e24cda84fc5fedb6e78be6.pdf?index=trueIn 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5332 bytes
SHA-256: e986330cca94632662804cf8c0e2e1302395608b2cd790fd522aa140835955be
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 11168 bytes
SHA-256: b75c281f7bf83a28dd19cf9d0b6d0959297cdd2a2015459cfe72684d85afb7a7

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