Malicious PDF — malware analysis report

Static analysis result for SHA-256 d175135edddbfa16…

MALICIOUS

PDF

74.0 KB Created: 2021-04-20 08:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a3284ee53f44485b9fed448d3e612df3 SHA-1: ace7e6c84b30d4e34eeae87eed0ea143716d0bb5 SHA-256: d175135edddbfa160f674b8207ddc25e56a0fd6326c9c737c3a344a0f7aa9517
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious 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 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://lozipotod.ru/strik?utm_term=how+to+scan+with+baofeng+bf-f8hp PDF link annotation
    • http://complerbnp.com/1422472714w8otg.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/how_to_explain_phases_of_the_moon_to_a_child7qopm.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/ifhdirU/tinelekedebekuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/g7D7gd9/kevimonixuwufujufi.pdfIn PDF document text
    • http://hh666o.site/bbc_history_of_world_war_2_hiroshima2tyg5.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/gi1uThc/dinosaur_wallpaper_peel_and_stick.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/gcIu1ij/radawinedesozavukose.pdfIn PDF document text
    • https://cdn.sqhk.co/pasovevutuvi/jjehg1I/xividilunagodarutoba.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/autocad_lt_2007_free_trial_downloadrsmy3.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/causal_research_design.pdfIn PDF document text
    • http://faxagigotitij.66ghz.com/blue_parrot_b450_xt_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/Usjgjap/nigerian_defence_academy_courses_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/k5ggigD/anime_soundboard_mod_apk.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/rimejiguvif/xuvonalir.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/wafiboziranutafa.pdfIn PDF document text
    • http://bojidalukin.epizy.com/jaratakiseziwewumozekole.pdfIn PDF document text
    • http://gukedam.rf.gd/sazuguwulapegunidu.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/wetherspoons_curry_club_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/minecraft_castle_turret_design.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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 5568 bytes
SHA-256: f8a07086bf570b46f27e9bb81eeee083b32bf0d2843eb050968520b7dcf4973b
font_01_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 10800 bytes
SHA-256: 8b4c06c38daa9818980bf7b25d9f1c6da625bdc0a74e697ba05965ab9a457473

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