Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d4e5c7b9d5f071…

MALICIOUS

PDF

91.0 KB Created: 2021-04-17 07:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8b0fd558608b66774415cd09006a7e05 SHA-1: a72d1704bb2650e86ceab47665af7214c4d43c56 SHA-256: 57d4e5c7b9d5f0716639dd74f9e538483c8f0b50bde3304e78a73ee7e0ce75e7
166 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to suspicious or disposable domains. The 'PDF_SUSPICIOUS_LINK_LURE' heuristic indicates that these links are likely invisible, designed to trick users into clicking them. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan. The primary goal appears to be redirecting users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jottigo.ru/strik?utm_term=proctor+silex+commercial+coffee+maker+how+to+use PDF link annotation
    • http://ozalupa.space/what_genre_is_the_series_of_unfortunate_eventsr3wam.pdfIn PDF document text
    • http://pochta-24.cc/43933904874l4py.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/0v83ger/candy_cane_lane_movie_2020.pdfIn PDF document text
    • http://bilkaita.space/jerujexoxusoxusulouma7o.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/fr7jggc/bidimapazogukonek.pdfIn PDF document text
    • http://hayatevesigar.online/engineering_mathematics_important_formulasi2s5l.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/hbhhjbf/wazukisejanebavugo.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/aZgeWia/wuduzegitew.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/how_to_become_a_certified_welding_inspector_in_californiauvfwy.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/gkB4zjj/mobile_payment_companies_market_share_in_china.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/a9w0hbG/tudodowiwa.pdfIn PDF document text
    • http://comforfemj.fun/dolivurotukemizijomadoguyj4gj.pdfIn PDF document text
    • http://loginwithfb.site/study_guide_for_aws_cwi_examefaf6.pdfIn PDF document text
    • http://matrixbicycles.com/absolute_rc_heli_sim_mod_moneyuixqf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7dffd3-7944-4408-a4ae-ed82dc473fc6/french_vocabulary_lists.pdfIn PDF document text
    • http://lamuverifob.epizy.com/97626103887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9970b17-291c-4021-8f0e-bd7ec225ea1f/how_bad_are_crosley_turntables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd03333-716d-4df3-b4b7-5b1fe21c4192/easy_veg_sabji_recipes_for_dinner_indian.pdfIn PDF document text
    • http://jijomelaj.rf.gd/gomunusekofodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5922335c-8fc3-40b8-b9fe-6225da5c370c/what_are_themes_of_art.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_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 5344 bytes
SHA-256: 021d86292c7e823f60607ec93a0d15ced5168ca9bac04f60569875505fd6ca93
font_01_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 11008 bytes
SHA-256: 9b4dccf2585d4873f029f91bb156096ddc9d353ef52ab557c8568ad0787cb37a

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