Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54a9fa455269529…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 23:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6424ff0f5e76b2ace8a3af88ca1d1984 SHA-1: 4968cf5672978443d555cf0003cba4f6d5b7a3c4 SHA-256: a54a9fa455269529b5005d6d69ab17d7ff96791953f42ee6de6f8b606cbe7b5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this. The ML classifier and ClamAV detection further confirm the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to a second-stage download or phishing page.

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://nipisod.ru/strik?utm_term=haynes+repair+manual+for+2007+dodge+caliber PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469359/normal_5fe8ac924c2e6.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/xezenor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5ff276f6ce22c.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/hgiohof/93509977212.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/qiiihy0/slick_slime_sam_diy_atm.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/jfnhdUh/dizixulof.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/wvnjiii/crashing_uk_season_1_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/aOujjie/sisters_hospital_ob_gyn_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/jgihdN7/5417848459.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/ramurusijubuzafigi.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/hfhdjjG/snapchat_logo_png_black_transparent.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/gdhbWND/traffic_tour_2020_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/kBlvicN/lebara_mobile_store_near_me.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/pisedij/screen_recorder_app_apk.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/charisma_on_command_charlie_houpert.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/ncees_fe_results.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 6032 bytes
SHA-256: 2d88029011eb86301443131cb5a8a62a9c299512e5b10f592514a38e2c2eb151
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10980 bytes
SHA-256: 6692b9002842e742a6ca283a07e6f13fdfe918d72b424171c1f438ce7847290a

Open this report in the interactive analyzer, or submit your own file for analysis.