Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e451173adf0715…

MALICIOUS

PDF

87.2 KB Created: 2021-04-23 07:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 316ce360d648c28789a91f003a5a677a SHA-1: 15ca03977b493fc0d8208bb4bcb099794a193c13 SHA-256: f9e451173adf07155f4b5a34edeaf9134b24d6d81214b8dd406604bfe58d95f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, with one prominent URL pointing to 'baarspo.ru' and containing a search query related to Skyrim mods, suggesting a lure to a phishing or scam site. The PDF structure also indicates it's a link farm, further supporting the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=best+skyrim+mod+load+order+ps4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff205a5e3b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_6056eaf056b4a.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/fiahgTK/70146072137.pdfIn PDF document text
    • http://pigexavenume.iblogger.org/63870930595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_60652a57a1f5b.pdfIn PDF document text
    • http://future-techno.ru/60129551237n50m0.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/PiQmgeW/bupopesulakijupimal.pdfIn PDF document text
    • http://wonder-ita.fun/model_3_performance_0-60_2.9jdf6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fce88be004cf.pdfIn PDF document text
    • http://connexion-amelii.xyz/napuradowetiwidmj4e.pdfIn PDF document text
    • http://wunowixumofe.22web.org/innate_and_adaptive_immune_cells_in_the_tumor_microenvironment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_6065ade64cfe6.pdfIn PDF document text
    • http://straponartist.com/83443868567z8i76.pdfIn PDF document text
    • http://arbitestpark.xyz/zufobusiluwujarusuvejobem6m4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_6015ae7416d67.pdfIn PDF document text
    • http://wow50.pro/600749428710t0mf.pdfIn PDF document text
    • http://cetapp.xyz/napugazebizamaxuwecslca.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/gcgiPqS/download_game_hero_x_zombies_mod_apk.pdfIn PDF document text
    • http://proba7.xyz/granado_espada_veteran_to_expert_leveling_guidem2bwu.pdfIn PDF document text
    • http://barashik.space/az_dmv_abandoned_vehicle_form16m0b.pdfIn PDF document text
    • https://cdn.sqhk.co/mazasofuw/hzNiejg/xujizonodez.pdfIn PDF document text
    • https://cdn.sqhk.co/xonizarisu/biajcCA/54029662842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bewexipobafuza.rf.gd/friedrich_nietzsche_-_on_truth_and_lies_in_a_nonmoral_sense_summary.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 5408 bytes
SHA-256: 4537d640a43c7945823289227fd5f78258fedc3f2d44dedc7da68a0242486a3c
font_01_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 11888 bytes
SHA-256: 02cefeceb0ed533bcdcf53da0d98a22017997693a189b47877c1e88b18191068

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