Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c415ae7b9720a8a…

MALICIOUS

PDF

79.4 KB Created: 2021-04-21 08:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 41f8b64fe4c462bebbd9910da1061bc8 SHA-1: 646e7cda0b7661f98876b0277ccbaa7eeb3cc622 SHA-256: 6c415ae7b9720a8a2834c09bfeeb1cdd3dbcc65ad381c1f245940caeafc9bbd5
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=esio+trot+film+wiki PDF link annotation
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/pomomebimipiluk_menijabisolib_xusoxamutu.pdfIn PDF document text
    • https://lataladegizozav.weebly.com/uploads/1/3/4/6/134685495/vumubi.pdfIn PDF document text
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/1159903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_60421fe278f2c.pdfIn PDF document text
    • http://cabinetsly.xyz/why_cybersecurity_awareness_is_importantjvqcq.pdfIn PDF document text
    • http://magnifioco.site/909177988197y8b6.pdfIn PDF document text
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/9717f841ced9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_600735ae39010.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/d723a.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/7149801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_60517a724314b.pdfIn PDF document text
    • http://ing-cliente.com/medical-surgical_nursing_assessment_and_management_of_clinical_problems_single_volume_10e35vli.pdfIn PDF document text
    • https://gojulujowavid.weebly.com/uploads/1/3/4/8/134886085/lunuwame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifajefowim.epizy.com/65320155506.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/financial_planning_and_analysis_excel_templates.pdfIn PDF document text
    • http://xujogefup.rf.gd/nuderagiruse.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/50564064855.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/capnography_powerpoint_templates.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_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 4816 bytes
SHA-256: a5d303ccacf00bb5d5d15d46aef9b3e0c07cd087df20b83ff263bd550eb78482
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 11672 bytes
SHA-256: f7fb4c7d73cbd2d1bea446543ec38e2dc38666ca5e10aa6de7a05f1df6b88b77

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