Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9dba5624ae2fad…

MALICIOUS

PDF

94.6 KB Created: 2021-04-04 20:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2684fad13fac8d184dded4e1f7bd3343 SHA-1: b15a63cbfcc546faac5efa739396a8f92ee8a766 SHA-256: 9a9dba5624ae2fadf3ae1dc1a303d50c3be191e6d337dae95144edd04ca9f018
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 embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to manipulate search results or direct users to malicious content.

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://jacksth.ru/wix?keyword=mann+der+zauberberg+pdf PDF link annotation
    • http://quickpapp.online/popuzux4m869.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/ahhPjgW/crash_car_pc_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/hRTnihj/97609328662.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/free_symmetry_worksheets.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/gunulevifejevak.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/hajfjay/download_boku_boku_mod.pdfIn PDF document text
    • http://swiss-gear.shop/dopedubivofixafabirefatiwndsb.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/jAggYif/91929751716.pdfIn PDF document text
    • http://xepuvibigin.22web.org/veputiponofobolezofoji.pdfIn PDF document text
    • http://milanomoda.site/chance_would_be_a_fine_thing_synonymzqg8b.pdfIn PDF document text
    • http://regse.website/subhash_kashyap_our_constitution_download8vmyb.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/jogodozevafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faperolakaf.rf.gd/biodegradable_plastic_from_potato_starch.pdfIn PDF document text
    • http://kuzelewekupe.epizy.com/liwew.pdfIn PDF document text
    • http://xofaxozewodaf.rf.gd/47816906820.pdfIn PDF document text
    • http://wutowaxodod.epizy.com/beautiful_nubia_all_songs_free.pdfIn PDF document text
    • http://bidififi.rf.gd/medical_case_report_format.pdfIn PDF document text
    • http://golipoximumi.epizy.com/bsc_mlt_syllabus_2020.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_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 5196 bytes
SHA-256: c43e033bfaec24c144e48d561141bce9e1f9c2574e55acf510af7911798e7001
font_01_sfnt_off000143a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A6 12748 bytes
SHA-256: 9b96cfe3acca6f3b9ca9e0e13ea3af0fdee4faf88306a88a792d5fd873895e87

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