Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9719cbba1f6bb17…

MALICIOUS

PDF

78.1 KB Created: 2021-01-28 08:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: da4133958695b0ed94e42a0dcd9c72d1 SHA-1: b57fc9650d383461555f04753d04e0b56ce89dec SHA-256: b9719cbba1f6bb171241ee070761171063fb66b2cc64c1b819ef6cf9287bbd42
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external 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://jacksth.ru/123?utm_term=hunter+x+core+controller+battery PDF link annotation
    • https://cdn.sqhk.co/jawutuwek/hcFryhd/lutosuwiwovodizorepofa.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/jg1jbgh/movie_box_office_collection.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/hBQgebW/35550229453.pdfIn PDF document text
    • https://cdn.sqhk.co/mobobelelu/MZTjhhe/video_poker_free_casino_card_games.pdfIn PDF document text
    • https://vuguwawu.weebly.com/uploads/1/3/0/7/130776175/vepetajela.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/vogikoperomisafarini.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/gOhjjb4/fun2_2_player_games_pc.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/govemumokabo-vaxitis-zejewi.pdfIn PDF document text
    • https://cdn.sqhk.co/jafakitiw/Kig2Aji/5248887292.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/vozixaborajuva.pdfIn PDF document text
    • http://sparzha.club/14953779359l9uys.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/KhfcigX/17770645070.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/eiaTgch/the_eye_coach_tennis_trainer_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/b1nTLlE/bitizupenen.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/paropabaru/bali_tourist_map.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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 4884 bytes
SHA-256: 4faf2a9cdeee17544f04ed7901bde8bb39641b88bf5f07bf27db249e91aa4d4a
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 13196 bytes
SHA-256: 628a026ae6b557b0e771dfb3d47d2e23b0f95a02cc8dd161d94579736ecac1ba

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