Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e04d35d81b6bda0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 22:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 95b31fef17fa66f918da43c2e7c94999 SHA-1: dac9e04588cec6be9cc709a5ae43a91f71a671ab SHA-256: 6e04d35d81b6bda0caa67a5c4e314ebf81d8b8671282cdad0ad2be2d9dc2b892
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, suggesting an attempt to redirect users to a network of potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chenruichem.com/upload/files/19190439662.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70c001573---wobemutipemugawinag.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/nugonozabufiwulamopazuxi.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/kexusagoxo.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/20063910237.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/88628411262.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zinesu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8674fea34a8bc6550e29471557ff35b8/23199597383.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/55657818858.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/jovujetoworegatunes.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/58280945654.pdfIn PDF document text
    • http://saint-party.com/media/file/jesifelutivarowenebo.pdfIn PDF document text
    • http://cecev.com/stockages/files/folapavita.pdfIn PDF document text
    • http://scarpatti.com/files/62470463610.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/faluziz.pdfIn PDF document text
    • http://gugugroup.com/userfiles/sidazenugezonesubosigib.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/34514740969.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vozid.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/30753717688.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pivatipeze.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/30797207897.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905140053.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/20299146326.pdfIn PDF document text
    • http://fxlcd.com/upload/file/fijomif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+long+can+snails+sleep+forPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 10636 bytes
SHA-256: 50a1ceff362e51daead3d17915ee6575c0a80a08e1544ae55217cfcc188f776b
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16960 bytes
SHA-256: 8a55a763a921c0fdcc10a5b37c8b1ff5cc0b0784b69549851bb98de9f7b922a9

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