Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf6d6fc2657992a…

MALICIOUS

PDF

87.5 KB Created: 2021-05-11 18:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c1bad338aff8dfd07085f1027ba6837 SHA-1: 8b5e513f3300a75d45dc9b7fa251c97bc7db9b3e SHA-256: fdf6d6fc2657992a8f2f2f859bc2c22a01b3f13b66927045530356e48d09ff2c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=best+stock+market+to+invest+in+gta+v PDF link annotation
    • https://cdn.sqhk.co/judebivon/FRgfWpU/sword_maker_game_apkpure.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/xafevoresurexos.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/8689162.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/treatment_of_prostate_cancer.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/igMiaja/wimotefa.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/Hjcja0O/horse_jumping_coloring_pages_to_print.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/5837762.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/90958057158.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/activity_based_learning_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_5ff404febd079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5fcaca722ada4.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/sorting_and_searching_algorithms_in_java.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/KHhhXgc/dnd_5e_animal_companion_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500450/normal_6047731598899.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/human_resource_management_gary_dessler_ppt_slides.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_is_a_good_score_on_the_hesi_a2_exam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakezemafatelo.epizy.com/konversi_biomassa.pdfIn PDF document text
    • http://keladosa.epizy.com/chopra_guided_meditations_free.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/sasukowivasewi.pdfIn PDF document text
    • http://kuxusosexoja.epizy.com/38245930330.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_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 5260 bytes
SHA-256: d53b6fb9e2ce1d554ce34581fbbf5af78d3f2806806dcfdee696e93837286fb4
font_01_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 11916 bytes
SHA-256: a877c48a94eaaba3b4aa4bfe5e61713e70112cdfacc9f0482e34a408f6fe8c83

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