Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19b38771ed19fec…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 12:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3a2585b0961d444db6933b9bc5fc6795 SHA-1: cd0d3b8d54f20dcaabc5f0d59079f26a8fd9ce55 SHA-256: c19b38771ed19fec77df47bf661aa4e49d2032f945592f70dde9f5d6480bfe5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=top+10+pubg+emulator PDF link annotation
    • https://ruta.hu/ckfinder/userfiles/files/91257954290.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/60364469880.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/94481791624.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/74427553349.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/dimidavavebozaranajed.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jumafafifafajagubutuk.pdfIn PDF document text
    • http://wwsm-us.com/files/file/6692632547.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/28f215f92f37df106c45dde0ea0de11a/47885011669.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/daxogafupe.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/buneduferenibaxezusagux.pdfIn PDF document text
    • https://ambalatender.com/upload/files/lawejudatexunijewekevuxo.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/76119509054.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/dezugufosalakiz.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/46422694725.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/76681931422.pdfIn PDF document text
    • http://www.siposferenc.hu/html/pinidixabonixapitotud.pdfIn PDF document text
    • http://only-svet.ru/upload/files/pirotiwosemezap.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r8kf4did2u71t780dsd1inkbi6/38875896594.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/98871503006.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/tugobujelavini.pdfIn PDF document text
    • http://citranco.com/users/files/62994947107.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/vemajevumelo.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/2272817859.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/babiku.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_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17536 bytes
SHA-256: 793cbcfe1c7b6c0d7f018e44ed63527d3db32e8ce58c6687cb68935f761811f4
font_01_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 10608 bytes
SHA-256: 30495a17efa78bf7de59678491d752376b4be579ae5625f7511ae5ee0932499c
font_02_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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