Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8379b518f997ed…

MALICIOUS

PDF

77.8 KB Created: 2021-02-15 12:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ad53d83358aa7ec6af67007c41705944 SHA-1: bc602b0ed880dc37e107764058819e6b53111229 SHA-256: 8d8379b518f997ed6b6b1c1352cc48440f1a99f199f8baa67159d08917b60f06
126 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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary one pointing to 'jacksth.ru', suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=the+practice+solution PDF link annotation
    • https://cdn.sqhk.co/wimiwupo/i2kbjhK/gafufitavupidixaziza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5feb3ad9e2180.pdfIn PDF document text
    • http://yoga-fitness.space/frogger_ps2_walkthrough2betp.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/hwBvRgi/baby_care_products_market_size.pdfIn PDF document text
    • http://beach-fruit.fun/918256425654y6m.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/z8Qihia/sound_spectrum_analyzer_pc.pdfIn PDF document text
    • http://znasila.ru/jumaph5vq0.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/dhin54T/53179673143.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/mgehAgh/lofura.pdfIn PDF document text
    • http://itfamily.info/59096264661okklb.pdfIn PDF document text
    • http://kamaz-ftc.com/how_to_print_with_ipadklx2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fd7d062d9666.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/phaicW1/shopping_list_template_word_document.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fd65afe30204.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/6Pidifg/dragons_rise_of_berk_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/fiiicd5/sure_shot_gun_range_lakewood_new_jersey.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/U7Rzdmu/lip_artery_anatomy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feb34ee01dca.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/gosete/fupitugu.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/contract_template_for_landscaping_services.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/90046266264.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/1527460288.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_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 4968 bytes
SHA-256: c41f76eb3e9c210b1e13dd2cb09880801b9c5929fb7bc42a1ee3e0e5e99e9652
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10144 bytes
SHA-256: 34d1bdffd43b02ce926a326fc19e2511622bb36075f5289d6d981118bd6cf40e

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