Malicious PDF — malware analysis report

Static analysis result for SHA-256 79294105ae535657…

MALICIOUS

PDF

74.5 KB Created: 2021-01-23 18:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 72af0f44a1fa0364770b8491f866ffb7 SHA-1: 4bf79a6356930560d86f6f13ab78228cc76fc925 SHA-256: 79294105ae5356575a6d5cdfe67f18de5a08a54c40280be86d5fcab26aa364cb
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous links, many pointing to disposable hosting and a redirector, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains text related to downloading sound effects, aligning with the malicious redirector link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=wrong%20buzzer%20sound%20effect%20download In PDF document text
    • https://cdn.sqhk.co/fedovipawe/eagfigg/christmas_song_quiz_online.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/439549.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/czghhem/elementalist_gloomhaven_painted.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/13bb4c6.pdfIn PDF document text
    • http://fogozuvonuw.66ghz.com/billboard_music_awards_2019_performances_taylor_swift.pdfIn PDF document text
    • http://delojenopow.66ghz.com/french_nail_tip_guide_strips.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/streamlabs_obs_ndi_plugin.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/erW9hcw/a10_rowing_championships_2018.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/1019581.pdfIn PDF document text
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/wakedevavaga-damidawe-pogufamonaxibeb-supafajube.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/Bihibhb/halloween_events_today_near_me.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/6340678.pdfIn PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/5123059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubadix.epizy.com/noron.pdfIn PDF document text
    • http://judafigot.rf.gd/clash_royale_game.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/57423557686.pdfIn PDF document text
    • http://zovawawopo.rf.gd/balanza_de_pagos.pdfIn PDF document text
    • http://mugevewobota.rf.gd/xibutupe.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_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5484 bytes
SHA-256: de9ab1431887fc02eac54e0f88c08eacc34317020f369a537f1fcc051e985312
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 11080 bytes
SHA-256: d931f0bef6995b190021d95f6775e702760b8f113161b2dd11f422c50f709123

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