Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de5ef1a19bac931…

MALICIOUS

PDF

73.1 KB Created: 2021-02-28 04:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 968ffb22dc4091d3f688981cc2b0b231 SHA-1: 1919298a1f2ef99fd11fe38705276f8a9023b87d SHA-256: 8de5ef1a19bac931d93458bad3e6f6e620fb4d3af517775d879d466425dab595
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, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating an attempt to redirect users to malicious websites. The document body, though heavily obfuscated, appears to be related to a product, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=m+audio+oxygen+49+iv+49+key+usb%252Fmidi+keyboard PDF link annotation
    • https://cdn.sqhk.co/noneniwetav/sYiiggw/goketuwewumerixore.pdfIn PDF document text
    • https://rotasemenedifo.weebly.com/uploads/1/3/5/9/135985080/510203.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/xomavak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_602584cdc8a8d.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/2009_civic_service_light_reset.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/ruvaramefese.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/hricuoK/43873404255.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/what_game_controllers_work_with_fire_stick.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segotemit.rf.gd/what_is_the_best_exercise_for_anxiety_and_depression.pdfIn PDF document text
    • http://nepopenezum.rf.gd/logitech_harmony_hub_alexa_france.pdfIn PDF document text
    • http://renawexit.epizy.com/samsung_wf220anw_xaa_manual.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/ion_max_lp_conversion_turntable_with_speakers_review.pdfIn PDF document text
    • http://topeleseluvon.rf.gd/stihl_fs90_parts_uk.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/sowima.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_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 5832 bytes
SHA-256: 0e027d9ed4f680dedc737d111bcd56ad107397bb63873692abcfe7e971a7e751
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10520 bytes
SHA-256: 87ec5ae0066f74890abbf5c0580865dfc663f015dfa5d3cb124690ed2a0ec329

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