Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d0395831ee528…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 21:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f363db6188871c011cd07e93446a4a39 SHA-1: 0a8d6088b892dfd4db2007a5e14376ae7c954f8b SHA-256: 7a9d0395831ee528eab1317031b943b6102507d88a75a405529f5ea0fa36b162
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate attempt to create a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mmoxx.mn/userfiles/files/ranarusetuga.pdf In PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/xorewipuj.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/82261584464.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topuzeses.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/5670282074.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/latutugobifa.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/92c9fa0e7ca3349f2e30347752df13a1.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/16255896594.pdfIn PDF document text
    • https://kiptep.ru/file/jonukelifojab.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/fupuwes.pdfIn PDF document text
    • https://lecachet.fr/docs/files/kuvimovejexozojezuwepa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/supujabova.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/84707375801.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jurotevinidano.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be6da1a93---muwazibinolifugeka.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/79547970368.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/11252861382.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/fapofok.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/28839241616.pdfIn PDF document text
    • https://lordoptika.hu/files/files/7861831060.pdfIn PDF document text
    • https://angem.fr/userfiles/file/tuwoxekuvuludatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=i+hate+you+rom+hackPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10344 bytes
SHA-256: e9e0c876e3b60fe4b05db780eaa8541d1a2db31d6861ed356bef5eda5ab4593f
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 17464 bytes
SHA-256: 250bfc64081fd4c0f20e991114794f64065917512eba67eb80906a4a57d42d3f
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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