Malicious PDF — malware analysis report

Static analysis result for SHA-256 088edf90978f03d1…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e78184abd847712cc18df7b14607de85 SHA-1: 1ae5e6e231a417fe3bae65ab534dbfc306051794 SHA-256: 088edf90978f03d1e6a2f02f7ac19338399b8d52552f4713c4f173305d51dd72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with the primary heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ntpuvoice.com/ckfinder/userfiles/files/fawemuril.pdf In PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/52854367775.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/vofevi.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/difubizib.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/ruximezovuke.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/82806887526.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/89252604836.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/toromimis.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gadudalugubezej.pdfIn PDF document text
    • http://12shio5.com/contents/files/76145719506.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/47404704228.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/tixagedewowemab.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/12084465013.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/31179790550.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/midemase.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/69439658038.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/9326124579.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/35369653999.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d0de918b---japulitumejifimotules.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/nogodokovilemi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615035ea2d872---jirofadelatofigeridokiv.pdfIn PDF document text
    • https://kaimano.it/file/65249222241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=examples+of+correlation+without+causationPDF 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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 17172 bytes
SHA-256: 292b0857949aff14453ae06b099cf6b076707e45cc813847b3020710e3448129
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 11016 bytes
SHA-256: c2437ee8e2fa422bb103285fe3a3c1cb57061cd393690552beea10d738c72d9b
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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