Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf54ec2d721ac57…

MALICIOUS

PDF

73.9 KB Created: 2021-03-17 12:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d987771b688eb8e310f2445ac4adebc SHA-1: 8003e8f89ef56e78c53c37a158bc41476b380121 SHA-256: 5cf54ec2d721ac57ae660f405ebf08edeece941b21fd34d89f76fed9515300cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=the+game+of+life+and+pets+instructions PDF link annotation
    • http://mobile-media.moscow/fall_foliage_report_blue_ridge_parkway3ciay.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/68191356068.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/ball_blast_game_free_download_for_pcidswp.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/6920485953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fdeae0d17648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5fff12a85358a.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/what_is_the_timeline_of_the_walking_dead_world_beyond.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/autumn_leaves_piano_sheets.pdfIn PDF document text
    • http://demask.fun/rigesi3b85y.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/MjhSNgr/59413660352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fd5ff11bd36d.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jhhbVif/zombie_derby_1.pdfIn PDF document text
    • http://matras-24.ru/did_you_hear_wtf_i_said_tiktok_lyricsb7ad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5ffe5070a6185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5ff140ba381ca.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/cgh6jfp/puzzle_dragons_characters.pdfIn PDF document text
    • http://bupro.asia/vanomejibpbhir.pdfIn PDF document text
    • http://degitowexara.iblogger.org/what_size_tire_does_a_2005_dodge_grand_caravan_take.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donakabaxes.epizy.com/59125797398.pdfIn PDF document text
    • http://kamaxunavag.epizy.com/xalugefugopifixo.pdfIn PDF document text
    • http://baxajuzurajuj.rf.gd/guzosisagegefezowir.pdfIn PDF document text
    • http://totaraxidob.rf.gd/add_header_to_every_sheet_in_excel.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 5516 bytes
SHA-256: d918a62333578e678714fe1d26974ebe45b1162a7d9581ba3827109f5ff1b7b6
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10700 bytes
SHA-256: 3014822a2dc0e61ef44a586fcb6bc4026b3714c04ffa65e796fa47ad5874f1e4

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