Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c146438e1fb0ec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 15:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f54d2c832ebc6ff22dbc8190d572d234 SHA-1: a2a55876b0cdd735bcf423f430ced996c470fe59 SHA-256: 90c146438e1fb0ec8958015bc21eacbaf5bb50729df54aebb17060dd23f0eeb2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based interface with a clickable action that directs to an external URL, likely to facilitate credential harvesting or malware delivery. The presence of numerous external links and the document's structure suggest it is part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=best+car+racing+game+under+200mb+for+android PDF link annotation
    • http://sieuthihatgiong.vn/webroot/img/files/76464772930.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/womos.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34c850b9f---89312447712.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/38534443494.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/luwuniribolegakixekib.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/firamunozaxesivumobenop.pdfIn PDF document text
    • https://ibericadearmerias.com/file/57663799412.pdfIn PDF document text
    • http://roocenter.ru/upload/file/pubekukabi.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vizulakin.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/59281366495.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/79684196611.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/latimuwafafo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/40251402344.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210909114929.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/89904666040.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/37065148930.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/wojeleluja.pdfIn PDF document text
    • http://pronobile.de/catalog/file/21844958568.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/repajixinimuw.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/10290616690.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e1nls47cjlkidhcd6qp0v6vj17/timinegofoto.pdfIn PDF document text
    • http://falconltd.pl/cache/file/gugetirajumewegejini.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/bofisejifunifigazumulaw.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/vinutaxopuvorawijesatixos.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_off0000b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 13960 bytes
SHA-256: 2251f54e72d0a572451574d4ce1f2af9e544edff089b5cfdbae9863ced4922d1
font_02_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 11308 bytes
SHA-256: 2387bd1dda86cf9c716fa3105fec0844c4314c77bb6f0c10dc7016f633da41e3