Malicious PDF — malware analysis report

Static analysis result for SHA-256 764097298cfc0220…

MALICIOUS

PDF

79.6 KB Created: 2021-03-06 12:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eb31e0e8ff084a82bb16242c93cedf25 SHA-1: 63267c603f0471785231c40dfa77108c9fb658e3 SHA-256: 764097298cfc02201a88e73b3d7dd5c314422386f996a202edc7fcd4c2dc731d
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable or suspicious domains. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

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 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://lozipotod.ru/123?utm_term=how+full+is+your+bucket+for+kids PDF link annotation
    • http://midikakuvekume.mywebcommunity.org/maytag_top_load_washer_error_code_f51.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/simple_budget_template_for_an_event.pdfIn PDF document text
    • http://busibear.com/weight_lifting_routine_for_beginners_maleyvg6v.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/what_is_the_role_of_transition_words_in_an_essay.pdfIn PDF document text
    • http://stav-games.ru/the_art_of_shin_godzilla_zipoomyx.pdfIn PDF document text
    • http://wide-do.top/87309856328vik3s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotopokidag.epizy.com/accelerate_learning_worksheet_answers_key_9th_grade.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_f3bb9894d1f44509a8599398fb5164d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08acb3b4-fc3e-4448-bb85-0a92637bdd72/fatexuz.pdfIn PDF document text
    • http://xilagerezob.epizy.com/banded_water_snake_care_sheet.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_ad8ab3491eac47bbaa41f34415121b05.pdf?index=trueIn PDF document text
    • http://zotomogizolelaz.rf.gd/roleplay_story_generator.pdfIn PDF document text
    • http://jenovezojoso.rf.gd/adobe_color_picker.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/borilegorewulejazeso.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8e82e06ea98b4b53a1c10798d52ce4cd.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_6f7594ed54304941b68865be51c4429e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72d694a-324d-45ac-ae6c-548121345815/introductory_econometrics_with_applications_ramanathan.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_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 5164 bytes
SHA-256: b8419a030774a0a7a749c17474e2f82ebeb902082c093fdbf670abc0866535a3
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10632 bytes
SHA-256: d85d0773c41c62b2e7fe8bdb64d6e5af2b1922775ee60295867e836157b40d00

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