Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd102d453514caf6…

MALICIOUS

PDF

77.1 KB Created: 2021-02-22 16:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 66a7933d69f003c92779eb3a32804370 SHA-1: f91b229545d4ea3ad1d6c98574dbd3a0fa88b3e0 SHA-256: cd102d453514caf644399e17ceebc6bad76ce756fb38cf9b7572d0d96450dad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to exploit search engine optimization techniques to distribute malicious content.

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 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.
  • 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=using+fuzzy+lookup+add+in+for+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fdfd380ddc5a.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/2457087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_60230f57e8c7b.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/dMjeGhd/cloud_bubble_shooter_game_earn_money.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/djffiim/99822169839.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jhliLvP/thumbelina_story_plot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458417/normal_5ff25f8ae8bdd.pdfIn PDF document text
    • https://geduletulaf.weebly.com/uploads/1/3/4/5/134509924/fupodibej-rifepog-rusugak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6010c1cc4a778.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/zisabagetolamixik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fdc9aa0e26b3.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/l12ifia/monster_energy_supercross_2_xbox_one_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_602edbb84f11f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fcf49c901a36.pdfIn PDF document text
    • https://cdn.sqhk.co/zarudaletok/lEm5Mjh/world_war_1_deaths_by_state.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/muxozuvalubi/canales_de_comercializacion_internacional.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/aerobic_cellular_respiration_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/k53_learners_test_questions_and_answers_2019.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_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 5596 bytes
SHA-256: 83a8352979246b908e844d21bdb75b9dca83963221a33f29452ad3440bdbd587
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 11056 bytes
SHA-256: dceb9b56e6047147e4d541644867c984ed02ad0a4ad4bd697bd8e4f29c787d86

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