Malicious PDF — malware analysis report

Static analysis result for SHA-256 5785cdbe51217de3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 01:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6d808c107e1cd3a2f7fc6a480c672c7 SHA-1: 7ea5549ef9b7443a85e7060322d6fcfab97ab2a1 SHA-256: 5785cdbe51217de319d09992303da1e0499bf78c4a84b0698e69661a323c2407
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=multiple+bluetooth+headphones+android PDF link annotation
    • http://clairerolo.com/userfiles/file/kizejitinelifaxuxiwuwe.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/mowasaxumojun.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/81851103730.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/petagudazuxovox.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/likafebi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/gipudo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0f5a639e---91637152291.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/nuboxaziralidokok.pdfIn PDF document text
    • https://onecre.com/images/content/files/nuwog.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/bagexemibibigivof.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/tipuledoboxowozojazusom.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/69139502659.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/70254103363.pdfIn PDF document text
    • https://digireg.com/upload/88609738708.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/70221013010.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/zadivelubotewukob.pdfIn PDF document text
    • http://vhshf.de/File/36287371355.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/37f8396d531ff2398f8c2607c94d5c3d.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3b7ec3b72be7e3b43adb3eb7f55d84f3/fajapoko.pdfIn PDF document text
    • http://jawarakreasi.com/file/wapomibudanesagibuxi.pdfIn PDF document text
    • http://land89.com/ckupload/files/goxilovovinejutelu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xelog.pdfIn PDF document text
    • http://mobitransjogja.com/files/94633013746.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/vupibanoxadekoregeb.pdfIn PDF document text
    • 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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 17648 bytes
SHA-256: 84a4d2fd32517a7b125141c999c2d8b81658e84e620e000064d8a27424715284
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 10720 bytes
SHA-256: ea50426cccfb3ccc43a6ce318dc651afa3d7ed6a57e4913ee62ae5d266bfe404

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