Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab36cc1df213782…

MALICIOUS

PDF

72.8 KB Created: 2021-03-16 11:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 46e313a25719aabd1ee39285740005d0 SHA-1: 25f14798fb918b93c1af027518f8e6e827ab89ea SHA-256: 3ab36cc1df2137824a0a5535381c4d18f1fddeb12dcdc73dc30e796121abd370
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=recoil+rda+v2 PDF link annotation
    • http://fogafiv.mypressonline.com/how_to_change_electric_stove_top_to_gas.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/1260003098.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/BSigigZ/kefakabanaroralemag.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/VIsumYV/6627340990.pdfIn PDF document text
    • http://kikifikoxije.mypressonline.com/nonogibajoniwapotitanog.pdfIn PDF document text
    • http://sodaapp.pro/57262485092oor0g.pdfIn PDF document text
    • http://xomaweluk.22web.org/ccna_v6_curricula_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jjznhcZ/the_room_movie_2015_trailer.pdfIn PDF document text
    • http://hellochildren.online/coursera_machine_learning_andrew_ng_quiz_answersc6ct2.pdfIn PDF document text
    • https://zakonuvuluj.weebly.com/uploads/1/3/5/9/135984705/1285412.pdfIn PDF document text
    • http://doguzunagenuxo.22web.org/bokivufi.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/wamefejoj.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/arboles_de_decision_en_r.pdfIn PDF document text
    • https://cdn.sqhk.co/junukexad/hUhbbkQ/64822643791.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/majukojovabavaxut.pdfIn PDF document text
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/betaduseneje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezubigaru.rf.gd/delakusukazewoxop.pdfIn PDF document text
    • http://raziwisubuza.rf.gd/26233497706.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/emerson_gxt3-3000rt120_manual.pdfIn PDF document text
    • http://gojaxuga.epizy.com/21581925875.pdfIn PDF document text
    • http://legosipado.rf.gd/erased_op_sheet_music.pdfIn PDF document text
    • http://lufeneweb.epizy.com/hilink_5v_3w_datasheet.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 4952 bytes
SHA-256: 4c71028875f43d1d9b406f59044038ecfb2a399ab36dcbae27e068262eb39818
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 11424 bytes
SHA-256: ef2bb9debe64be02c17b23330b0bc18cf28d3bf3ac1fab5b3c4de06bbffe86a8

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