Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb17bbeda73ab07f…

MALICIOUS

PDF

96.0 KB Created: 2021-04-04 07:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5ae02ce0802f85c4263978209e4fda5 SHA-1: 83b075a12e0fa73eb286ba3b57ae10c0cd00ae2f SHA-256: cb17bbeda73ab07fa5367e27a6f363daa9e120f80a50c48cc098d1238c1622f2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, many of which are likely part of a link farm. One of the primary external URIs, 'https://jottigo.ru/strik?utm_term=social+learning+theory+of+aggression+pdf', suggests a lure related to academic content to entice users. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to redirect users to a malicious site, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=social+learning+theory+of+aggression+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370286/normal_600be5e6a0c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_60345b8631a2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_6040eaba63520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_6051687c27b03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_74ac485f609943f6823d7608c4d1533f.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_97a06347e8a6438a97bc839f7853491a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18677757-2bb2-4ab4-bebc-0997ae44d8a0/bizenifuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/33222508834.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_b5685d55c2bf499ea08f3d4d035fc025.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/xixodonijapifojabizilu.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/finonunogezisozuveko.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/road_vehicle_dynamics.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_563620ee6ce64b158766ee9744153f5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/dofonijaxuzexenudarukap.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/expressions_and_equations_6th_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/first_alert_co400_3_beeps.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/how_to_calculate_heat_exchanger_size.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/bored_button_mod_apk.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_bacd7b09ffb643ceb68db6d0ce4a9c38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/847ebc85-f166-4576-bf1b-b4dcd19f1551/what_is_knowledge_tok_ib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 5408 bytes
SHA-256: 428204aac75e701e4df327a559c09528c477bc6ff473ba6dfe773700c40e7d9b
font_01_sfnt_off00013df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF9 11504 bytes
SHA-256: 3f055c991de2c28a3ee1a54a7477a2219910df40408cffddee6e1a22541e20f3
font_02_sfnt_off00016499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16499 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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