Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8656acd34d6ff…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 14:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 131deaa854993f4b82c9a32959afd6ee SHA-1: 5526df3beace2fea1de05b43fde7e8c5cc5725ec SHA-256: 75f8656acd34d6ff88b0a9b929c4e508f6f1a244cb3af5b7a2f3ea1d9c581d94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a redirection attempt. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or to download further malicious content. The file's structure and embedded URLs suggest it's part of a phishing campaign, warranting a high confidence score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=ar+real+driving+app PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f2343a9ccd43d2a292587233692a3d5/misefuvetekefowibujoz.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/gifaweparigubog.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mefokur.pdfIn PDF document text
    • https://angkalaris.com/contents/files/tizufuvivajujuzejofowev.pdfIn PDF document text
    • http://www.heksan.com.pl/file/vuregivibirawajoxu.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/kakum.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/4cd3ce1271da49210af52e2bcc7a3c77.pdfIn PDF document text
    • https://sergiomauri.com/images/file/5903290174.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/pakenezolewawoxep.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/82379920073.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/zujuvuxigivokofa.pdfIn PDF document text
    • https://menu2uplus.com/images/file/32293281555.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2cccf18---30397912527.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/80339114008.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/99246447870.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/59464405979.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/46249807674.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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10228 bytes
SHA-256: 4c172840f12659dc2a3f26875723c183f460bd178c1138215c3f4cee4d7ef88f
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 18264 bytes
SHA-256: 767ecb8901246bea4fa3709ed0779b03d647263fda2ff251e007640a9e59ef17

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