Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bbedf436204a01…

MALICIOUS

PDF

71.9 KB Created: 2021-02-11 20:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 77e0a549a222286ca3e8f07e3f763cf6 SHA-1: 606cf8425ab5dee5e8d29f2b6b513c96b5fe8430 SHA-256: a8bbedf436204a010ced892694e9f796716d13156c96c727d3c4adedbb23ff99
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of external URIs and link farm characteristics further supports a malicious intent, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=gartner+magic+quadrant+crm PDF link annotation
    • http://idealsit.space/persuade_inform_entertain_sentencesxxmtx.pdfIn PDF document text
    • http://bitjoms.xyz/9790162108wczog.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/skillbuilder_practice_distinguishing_fact_from_opinion_answers.pdfIn PDF document text
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/namurogajotemo.pdfIn PDF document text
    • http://xojopimo.22web.org/kumabomipuzobowebad.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/jjPtm2X/22763543862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_600c8f37dead8.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/vfr_flight_plan_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/H8ihjhe/wrestling_revolution_3d_mod_apk_2k20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romezegipoxo.epizy.com/cross_country_flight_planning_worksheet.pdfIn PDF document text
    • http://muvipifipu.rf.gd/symantec_dlp_oracle_12c_upgrade_guide.pdfIn PDF document text
    • http://ziboporo.epizy.com/define_information_asymmetry_in_education.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/destiny_2_heroic_zero_hour_guide.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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 5204 bytes
SHA-256: 62dd74bd2f413612403ce0ea7627a8286acc25f7c898b85c4ea67da49e3cb668
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 9764 bytes
SHA-256: fb9e234710e0beabb21c92f83bb551370d6514f86fd4d271db154e3ac47b9f0f

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