Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c75caf1fa43554…

MALICIOUS

PDF

70.1 KB Created: 2021-03-22 06:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e44197b927da311e1fc239e0f06ad8dc SHA-1: 8aa662bc0e8f7741798d9a4e5773412b65c87085 SHA-256: 82c75caf1fa435548c18ee350a4639b27df2f359cfc39b867af6816aba8945e9
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are indicative of a spearphishing attachment, designed to redirect users to potentially harmful sites.

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://kuzutuzo.ru/award?keyword=approximation+theory+and+approximation+practice+pdf PDF link annotation
    • http://zunuruxeguxifi.mygamesonline.org/xudesubuvupazagef.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/christmas_music_songbook.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/xomokeretuwiwufube.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/fegumedele.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/why_is_it_important_to_have_clear_goals.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/jepiwi.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/jatimazakuruziw-wozugepep-tinilujiw-dukoretevunaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_602066a5b5336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_6055875f444ac.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/kafumajo.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/yard_machine_riding_mower_blades_wont_engage.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/non_verbal_reasoning_practice_questions.pdfIn PDF document text
    • https://vokinojen.weebly.com/uploads/1/3/4/8/134851280/45794e8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/rukukiranolujoponoba.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/29243279688.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/30670606641.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/cardinals_injury_report_nfl.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/how_to_use_craftsman_laser_trac.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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 5344 bytes
SHA-256: 039e96613f46087c51c5de538702a21700f30942d8371a85898bdec49cfbd64f
font_01_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 10972 bytes
SHA-256: a223cb203d51737184948c55c8a76143ccac5cbf8435faff300c6dd5f4eb20d1

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