Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dd3c91ab67d1b6…

MALICIOUS

PDF

79.6 KB Created: 2021-04-20 14:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c056c6a1af928e1f5fea2b0458d861b SHA-1: 8022d90a7f111fbb8ea2c3b6457b35b48cf70a0e SHA-256: d8dd3c91ab67d1b6d65944802d9d667a4ac3cae569dd67750fe3aec23f5724cd
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded links, with at least one pointing to a suspicious domain (jacksth.ru), suggesting it's designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=shark+euro+pro+x+steam+mop+manual+s3202
    • http://nitiwomifigurod.mygamesonline.org/cardiorespiratory_physiotherapy_adults_and_paediatrics_download.pdf
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fea4696430ea.pdf
    • https://cdn-cms.f-static.net/uploads/4474223/normal_600d5dbb2437e.pdf
    • https://cdn.sqhk.co/dovutiwabule/1ILhdOC/rumowap.pdf
    • https://cdn-cms.f-static.net/uploads/4452588/normal_60146b6363378.pdf
    • http://zopesozali.mypressonline.com/wumopavif.pdf
    • https://cdn.sqhk.co/fivuwunar/cgcgegh/adelaide_botanic_gardens_map.pdf
    • https://cdn.sqhk.co/tezofugowura/puCggYk/31448507614.pdf
    • https://cdn-cms.f-static.net/uploads/4459176/normal_60326406801f6.pdf
    • http://zulurasovuguloz.66ghz.com/71373504755.pdf
    • https://cdn.sqhk.co/bodujemep/XpHgfgi/tiserozun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e426ca6e-c915-43ab-aeeb-747da7fe3a5e/how_to_replace_car_alarm_remote.pdf
    • http://lodonevubepivor.epizy.com/51883725975.pdf
    • http://gilebufamefaf.rf.gd/pezavewafon.pdf
    • https://uploads.strikinglycdn.com/files/cc66a934-f8b4-4e85-87ab-278d2dd14786/after_we_collided_netflix_release_date_canada.pdf
    • http://dipibezepipes.rf.gd/modal_verbs_worksheets_intermediate.pdf
    • http://wikijozuw.epizy.com/linking_words_english_arabic.pdf
    • http://sasugud.rf.gd/87858306012.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17f.bin
932ac2ba9d7e29c749f47d12b646ff3465c3db232682df4a9781738f0062f514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5732 bytes
font_01_sfnt_off000104dc.bin
5c2c20f65f614615ed55226b04339cc0d9175941507a0ba9fdec44f9313ffd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 13304 bytes

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