Malicious PDF — malware analysis report

Static analysis result for SHA-256 d622342823c5fc6c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 20:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ad4922164210ac30392d1cdfa0ec773 SHA-1: 3a5e0f487da011713402bee123fae8fa359ecc59 SHA-256: d622342823c5fc6c454406a0abec39ad56963ec59bc8d140458833269a3a6efc
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. Numerous external URLs are embedded within the document, indicating a likely attempt to redirect users to malicious sites for phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=dragon+ball+games+for+ios PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd5057d02---91398865391.pdfIn PDF document text
    • http://evola.it/userfiles/files/bitaxobo.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/58568123388.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/52280822088.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/54786793176.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34690026941.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vitaxudumom.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/14279221366.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/tugizabovutokozebi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/62915946295.pdfIn PDF document text
    • https://schmitz.cz/res/file/96047673329.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33414118067.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/74989146967.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/36482886439.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/lupilivugut.pdfIn PDF document text
    • https://onlinendttraining.net/files/doputeku.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/26845647251.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/76859099184.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/jaboxerajimepi.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/gurududuf.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/29587337535.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rafesarut.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/757909a1bd2c4700fcd06fa696eb824e/feguf.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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 10600 bytes
SHA-256: 59183ee8147a37e92952b39ed7a0c4f70626ffdc3bc746e0ddc2fd329511cba2
font_01_sfnt_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 15108 bytes
SHA-256: d3becbfad67f9b91ac2cc4c011dd1d91513bc7c2dbf206a22cd35f09408e3032

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