Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbf96fe90f3e7a5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-21 10:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f90a69fe8ee9b951320f4ef6885eba7f SHA-1: eebb5c88537321e7bd9710c066f2a2045bab4f9c SHA-256: 1bbf96fe90f3e7a5ea820f81b39851026f02ca0ffa697af98f0f355385049150
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document is designed to redirect users to malicious websites.

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://midufefew.ru/wix?keyword=the+titan%2527s+curse+pdf+weebly
    • http://mojenisijita.mywebcommunity.org/the_bangle_sellers_workbook_answers.pdf
    • http://xazixovabifin.medianewsonline.com/bums_syllabus_2020.pdf
    • http://bawazofo.getenjoyment.net/gebugimokexedajawafa.pdf
    • https://cdn.sqhk.co/jerizukop/hgvrpjh/whale_evolution.pdf
    • https://wosabepowidax.weebly.com/uploads/1/3/0/8/130814575/pejewukanelapoxuzado.pdf
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/xijonuni.pdf
    • http://rozujed.sportsontheweb.net/41274444868.pdf
    • http://zaxevef.getenjoyment.net/31161181594.pdf
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/zogovoka.pdf
    • https://cdn.sqhk.co/nadizolobe/Y4v6Phc/minecraft_maps_skyblock_hypixel_guide.pdf
    • http://guzexesuge.mypressonline.com/bleed_indesign.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sebokegekesuded.atwebpages.com/bogavineg.pdf
    • http://kanabikovokes.epizy.com/fujilozebavosiniwivemas.pdf
    • https://uploads.strikinglycdn.com/files/9545f5c5-7c4d-40f2-9a1d-1c7ce7cbfe15/darira.pdf
    • http://roworozirad.epizy.com/misepivenerudi.pdf
    • http://gobusef.rf.gd/kisaxowisofepemabipuk.pdf
    • https://uploads.strikinglycdn.com/files/33960e9e-0856-4a07-abc1-2f5f1de5a6b8/29887480061.pdf
    • https://uploads.strikinglycdn.com/files/193f0563-0b34-4789-8c0f-948a21c2795e/hp_officejet_6500a_plus_printhead_alignment_failed.pdf
    • http://ruxofepugoloma.rf.gd/capitalization_of_hyphenated_words_chicago_manual.pdf
    • http://nukilaba.myartsonline.com/60164299987.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_off00010a42.bin
111e2dcc95fa5618431fcbd67e2833075932b07c9988f8d829f493d05100762f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 5560 bytes
font_01_sfnt_off00011d3d.bin
fe3fb9a919e146cedc852584eb95adfe5b8089a3826d86f64fbef9888c40b4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 10108 bytes

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