Malicious PDF — malware analysis report

Static analysis result for SHA-256 345e3942039f43b4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 18:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29b6b0d92cbc834ab8393cc0ad2f0220 SHA-1: 4bb0409d14c45a8726e49ecb220f6db56b588bc8 SHA-256: 345e3942039f43b4f984da1b93678511b7f2a11b13ed5a1c1f909bbb8ecc5259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm structure strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=android+samsung+galaxy+mini
    • http://alcantara.cz/data/file/nixotofu.pdf
    • http://donghotam.com/luutru/files/49643838274.pdf
    • https://temporar.mirceaseminee.ro/printuri-fi/files/kowujepidimumadaguguli.pdf
    • http://smileorganic.net/smileorgfarm/filesupload/File/31240127537.pdf
    • http://sooam.com/files/fckeditor/file/2101140484613f40333012b.pdf
    • http://ippinnudon.com/uploads/files/39310084928.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8b1645d1d---fefokerizitaroduketejan.pdf
    • https://fruitssupplier.com/app/webroot/img/files/vuxixeb.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/nozosegiwabifizosod.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/949e16ad687d70788e71db7c15e88e7c/93289004396.pdf
    • http://gldbirdgel.com/user_img/files/23842100036.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/rodidarugitub.pdf
    • http://022-web.cn/uploadfile/file/20210905222826920.pdf
    • http://www.hgbehringer.de/img/files/files/juratopukanovimu.pdf
    • http://computer-rudolstadt.de/upload/file/15307721765.pdf
    • http://sklepjola.pl/userfiles/file/nufulejuxupobituworofuj.pdf
    • https://cengilli.com/icerik_images/file/70216500496.pdf
    • https://texigo.tw/upfile/files/2021/09/13/59825362412.pdf
    • http://md-servicios.com/userfiles/file/5343973694.pdf
    • https://bayihoki99.com/contents/files/gazebusitosojowozowagem.pdf
    • http://lumieretvie.com/userfiles/file/vejefububakubidewawatega.pdf
    • http://abwingsva.com/uploads/files/guvamafatixegosof.pdf
    • http://achilleferolla.it/userfiles/files/72525196785.pdf
    • https://flardochform.se/userfiles/file/gojadubekesojanobo.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wepof.pdf
    • https://shian-jin.com/UserFiles/files/81572067808.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 16792 bytes
font_01_sfnt_off0000caee.bin
08ffe21ad4f1c997bb3a1fdaaaa2009c097a486e414b73c45db709d7318f2541		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 16964 bytes
font_02_sfnt_off0000f68d.bin
08cdc35fabe17d05d5001b93c25f3d52ee4af6c71b6ad02a51903708ca7285d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10660 bytes

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