Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a94e75f08627ae9…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 15:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8f4c9f28967ca8fe7a8344ac554227de SHA-1: 9000f51db05fda2ad6d1419a8f3349e6ea65f238 SHA-256: 9a94e75f08627ae97bf3a82e0d30bce430a2ced1b1b7adaaadda5aaccd18bde1
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, with one prominent URL, 'https://baarspo.ru/award?keyword=nat+analytical+reasoning+questions+with+answers+pdf', suggesting a phishing or malicious content lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

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://baarspo.ru/award?keyword=nat+analytical+reasoning+questions+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/tugirujozi/chXHcUP/bubble_pop_origin.pdfIn PDF document text
    • https://cdn.sqhk.co/nobegasosev/ghCigXF/help_annie_game_over_man.pdfIn PDF document text
    • http://dfwshootersupply.com/empires_puzzles_epic_match_3_apk9wy4c.pdfIn PDF document text
    • http://gasorutika.iblogger.org/dekedokapigo.pdfIn PDF document text
    • http://static-get.top/xoxapuzeludedobimamigati5wo4e.pdfIn PDF document text
    • http://carishr.com/612139920320k7is.pdfIn PDF document text
    • http://guliragitifor.iblogger.org/gatujunasaz.pdfIn PDF document text
    • http://reduslimitaly-official.website/10_examples_of_bugtong_with_answers11mss.pdfIn PDF document text
    • http://canonsburglake.com/jeep_wrangler_repair_costswj86i.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
    • http://limebeb.epizy.com/reversible_and_irreversible_changes_worksheet_with_answers.pdfIn PDF document text
    • http://bubexixan.epizy.com/43344394782.pdfIn PDF document text
    • http://wowimes.epizy.com/5546720543.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/myne_owne_ground_chapter_1_summary.pdfIn PDF document text
    • http://kesufelitam.rf.gd/acromial_extremity_of_clavicle_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/jederodaritova.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/academic_paper_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311b2541-f56b-4246-9014-0c176cb9f6f1/psy_gangnam_style_video_song_download.pdfIn PDF document text
    • http://rukateridexak.rf.gd/94507697983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead01be0-fad1-461f-bb8c-73fb8850cfa9/panini_scanner_not_recognized.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5588 bytes
SHA-256: 0e036f6fb8e04817a8184912ed726d5cd52ee1b0fb56da8375f1a12fdf76f518
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10584 bytes
SHA-256: f08943e5606d8ca25a580f4af3b9fb48197ca7059a182ccc45a7aa3537277796
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c