Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2566348d4ff57c…

MALICIOUS

PDF

71.0 KB Created: 2021-03-30 03:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1605a943b002f6c54902cb1810ee9959 SHA-1: 9996cf5e2b1ac4fe2a6c4f98a165cdb66ccc5d32 SHA-256: 1f2566348d4ff57c6a374b7af30264def2d5c4be4a0178417677033b33450240
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 URIs, with at least one pointing to a suspicious domain ('maypoin.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were extracted, the presence of multiple external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=2013+amc+10a
    • http://wuramegojuluz.mywebcommunity.org/auger_electron_spectroscopy_instrumentation.pdf
    • http://fobexugelego.getenjoyment.net/65896288687.pdf
    • http://pezozolagipiv.22web.org/27704346130.pdf
    • http://tefituguj.iblogger.org/32847681462.pdf
    • http://sizegoduxuxa.mygamesonline.org/el_general_naranjo_serie_personajes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jisunopesaluzi.atwebpages.com/alphabet_board_games.pdf
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_f599f27a8932443c84508d18be27cf5a.pdf?index=true
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_4d8d04cd79624e21ba6450ea7bb8c27f.pdf?index=true
    • http://zalerifi.rf.gd/sixajav.pdf
    • http://fowimifefezujo.myartsonline.com/wuxemijuve.pdf
    • http://pozimefenud.epizy.com/75144177051.pdf
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_23d897ff754b48e6b65206481a8887e9.pdf?index=true
    • http://lujebanamof.epizy.com/child_art_developmental_stages.pdf
    • http://paguxesij.myartsonline.com/bsmrstu_a_unit_question_bank_download.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_16438a720bf946a5916a2132a57ee356.pdf?index=true
    • http://jevitof.epizy.com/natebozoruvelanikapavegug.pdf
    • http://koradanizepagow.myartsonline.com/75409609212.pdf
    • http://lafagelupuf.myartsonline.com/60970812717.pdf
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_127276655f9842a68ee06d8c7deca3a2.pdf?index=true
    • http://pejemevogoge.myartsonline.com/automower_installation.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_off0000d775.bin
79e098c6d5bd3003508c2e8810cc3b4298cb281a43b460d951de02d66c35317a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 5036 bytes
font_01_sfnt_off0000e88a.bin
9a6916d2f18b9997acb29ae05a55fd0b7a4611e5f805ce673da1f13feab756b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 10880 bytes

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