Malicious PDF — malware analysis report

Static analysis result for SHA-256 4effbc5ad2ef6dbc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 09:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bd62040f2b3c18159448f88443d2d34 SHA-1: 64a539121eab833e437f3066ad049b1eda1328fd SHA-256: 4effbc5ad2ef6dbc80a3aa94d2a10ff3dd78ffb70507c36c6618e3becc34fd5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm, directing users to numerous distinct hosts, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jongauger.com/userfiles/file/21849787436.pdf In PDF document text
    • https://majubesar.com/contents/files/40318161321.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/vawibarodatolelu.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/vezotipuvedopukujomuli.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/wozepujilaturutifowu.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/zeniminesatamorigije.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/kokog.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/nopofodetawiwa.pdfIn PDF document text
    • https://tcremich.lu/files/files/89616685563.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/dizepeb.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/22144097892.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/vemago.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614270266794a---fudedirexege.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/52916288054.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/risivuguko.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zogineg.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e3ae3c55---29894717420.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/xideleduj.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fafade.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tirunurejexo.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/wojawor.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gajalevoneri.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/56578731057.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/91409968045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+exit+activityPDF 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_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 17424 bytes
SHA-256: ba2afce59354c781571a9131b4fbf01f54bbb332a8670b580c7d61cc9ebfea2c
font_02_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 10412 bytes
SHA-256: e050b26097f4d051fd40fb328ec19cbef571ceacf10c1171a8a1c32a9fe80aad

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