Malicious PDF — malware analysis report

Static analysis result for SHA-256 599cdb5209846a95…

MALICIOUS

PDF

87.7 KB Created: 2021-03-27 20:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02074907082bf7e4943adddfdd019ffc SHA-1: f04785aaaea54243334d427e4c44f6276a3abdd4 SHA-256: 599cdb5209846a950b796de1348a4afbea99741a938fb0e72008a40d43fbc981
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a significant portion pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://resalured.ru/123?utm_term=bandari+ki+dulhania+song PDF link annotation
    • http://summ-ita.space/certified_analytics_professional_handbookcibko.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/bullying_speech.pdfIn PDF document text
    • http://civiliscmq.online/how_long_do_you_cook_a_brisket_in_a_roaster_ovenni0ft.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/jidWwU4/critical_action_gun_strike_ops_download.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/qifggii/subway_runner_game_apk.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/genapuwajolujifejivajopo.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/c9jjgcA/the_history_of_hockey_game.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/41009321191.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/temujonuwu/73024867131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efbb17c-ccf3-4c5d-b50f-bad02dd3d4bf/universidad_tolima_sede_sibate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4bb651-522b-4e7d-9543-66aff497bca4/33381136114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ec81a2-5339-45c7-9563-5f5e61f4673c/rimakudalobaxuveji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc78aac0-ca56-4b02-9569-101be113850f/fudge_a_mania.pdfIn PDF document text
    • http://zapusov.atwebpages.com/78754541540.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/38289743692.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/cphq_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/42213207584.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/lorejug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2459f8c0-5f25-4200-a256-670ef249c1ff/heat_n_glo_fireplace_turn_off_gas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 5200 bytes
SHA-256: c4bdd2f7da1b2dd9730e883bf65caea5c60718ac550d810f58c965972ed012a7
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 11372 bytes
SHA-256: 0cb3cbaad628b0da32e94deea69d7f40a800a434a4344d6b9c2c7ea4717fdbf9
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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