Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b320fb6187ab2b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 05:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 976dc14c8375134e7fc751b49a93bd06 SHA-1: 22b6cf75d7889269e064d36cb5e88c0555358bf0 SHA-256: b1b320fb6187ab2bca115b5ffe464ff8fce661fa721bd1e207b26a7a4d5b281d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.zolmedis.lt/ckfinder/userfiles/files/jimuwuke.pdf In PDF document text
    • https://istanajp.com/contents/files/mitatexasezesefu.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/notubapupul.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zexopevukaje.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/kugamikiti.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/vinuxuvawebufosedupewevi.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/49115556280.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/lopisoxoroz.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/10638766022.pdfIn PDF document text
    • http://glassick.com/userfiles/file/95043336662.pdfIn PDF document text
    • https://ebooksweb.net/files/file/99093049906.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zemerekiromunodudos.pdfIn PDF document text
    • http://centronegozi.com/public/zugoxubifamafatevavufa.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xujos.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/58297895501.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c6cf3e58---metud.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/15170021485.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/filunododazilufapovokul.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/sabaxekurexade.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///vutanan.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/44424071210.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/duxedijobenufuvumog.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/34204778684.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/79040747841.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/26832707853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=control+samsung+smart+tv+with+android+tabletPDF 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 17192 bytes
SHA-256: b33ab6626ca6be058e1f75576303b9ae1e582b7b7de5fa54a0e1f1532a1cc66d
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 11120 bytes
SHA-256: ba243b63c31e84f4a58638884353a7a15d9b105185d534281b649c81f3c58f3d
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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