Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f35aa3521bd5b76…

MALICIOUS

PDF

83.5 KB Created: 2021-02-20 23:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 214a68b112b6ba89c2f4a86a7c7be708 SHA-1: 5f1fe4cc12a6d44ff870e905f66b7160deba603e SHA-256: 2f35aa3521bd5b76db8d4419b770e6f8a2edef30546bb88f8badbe85f5c5760f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to survival skills, likely to trick users into clicking the malicious links.

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://jottigo.ru/strik?utm_term=mors+kochanski+bushcraft+outdoor+skills+and+wilderness+survival+pdf PDF link annotation
    • https://cdn.sqhk.co/levowexesu/h8Ksife/super_mario_3d_world_review_zero_punctuation.pdfIn PDF document text
    • http://dimoguzix.iblogger.org/92084955322.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/bhepKhb/live_satellite_view_gps_map_travel_navigation.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/hjgeugh/american_truck_simulator_2020_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/hb4hiji/xavawuvaf.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/gepopojumejex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466173/normal_6003ca33dd552.pdfIn PDF document text
    • https://wutekeli.weebly.com/uploads/1/3/1/3/131379380/3678565.pdfIn PDF document text
    • http://weraka.online/dopukufejibwrz6.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/zokinowoligabid-makekuzusatarub-fumugidosapamo-tisojaxig.pdfIn PDF document text
    • https://sewetupowak.weebly.com/uploads/1/3/5/9/135971958/dukoputuwake-teretudebas-fumafelevo.pdfIn PDF document text
    • https://kotepavugenufe.weebly.com/uploads/1/3/4/5/134592782/kalimalakofolazubox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_60309a8aed876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jugefewaxuxuf.epizy.com/accounting_information_system_syllabus.pdfIn PDF document text
    • http://kunimaz.rf.gd/35074859268.pdfIn PDF document text
    • http://jexonuwunow.epizy.com/poker_hand_order_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 5488 bytes
SHA-256: 91c701e97c8e21972f8f1b59e40665b7e35dbbd16c327316d88e597512a9fdeb
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10204 bytes
SHA-256: b731c75b6b5d9dce80d1cb6f0088cedbe872c1407436966acb3b372046d058b1
font_02_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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