Malicious PDF — malware analysis report

Static analysis result for SHA-256 d753ad0e1873f37e…

MALICIOUS

PDF

71.4 KB Created: 2021-02-16 23:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4067299dd8a34ab5bf5221a48ea0908 SHA-1: 88200e5bf00b907940fe9aa95833ea3ed153b62e SHA-256: d753ad0e1873f37e7107ef8e9890f214d379ecc1cb2f937b8d667f1527c0624a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The document contains numerous external links, including one to 'jacksth.ru', suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=how+to+take+blood+pressure+with+omron+cuff PDF link annotation
    • https://cdn.sqhk.co/fuvebopeweb/eSggQK2/open_puzzle_box_level_47.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/6493739.pdfIn PDF document text
    • http://girlsbeach.space/buffy_coat_preparationo0l3h.pdfIn PDF document text
    • https://vosifiteke.weebly.com/uploads/1/3/6/0/136049758/nipegonidovozekegego.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/FEjjgcG/the_blue_room_movie_watch.pdfIn PDF document text
    • http://trokot-shtorki.online/guxuduxevagilukuxalo5zaj3.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/J9hex4p/microgolfoven_combi_krefel.pdfIn PDF document text
    • http://1fps.ru/42784076806tuhdz.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/riwuvivak.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/7514484.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/ihjavSj/9902237804.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/hrIhhhb/gepasodepe.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/fujadabez/cervical_cancer_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/alcatraz_the_room_escape_game_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/accelerometer_android_sdk.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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 5652 bytes
SHA-256: 7e90ac9bf5eec5d32848e529a465bd67475d274f67cc64035749e5602193bb1b
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10836 bytes
SHA-256: ef735dc26e0363864e2b139d8dd28fafe39f2f89be8f0ef2c7a7dc1e91296ff1

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