Malicious PDF — malware analysis report

Static analysis result for SHA-256 17df42130b914ff9…

MALICIOUS

PDF

168.9 KB Created: 2021-01-20 12:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 491e1020ea15308f51c966000df29169 SHA-1: e6bac12989455827a0591a18794e803b89797e6b SHA-256: 17df42130b914ff9dc73183d2ed9c788ee7a931fe63bb3956ee370faacece7a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a site offering game cheats or other lures to compromise them. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://traffnew.ru/123?utm_term=horse+haven+money+cheats PDF link annotation
    • https://cdn.sqhk.co/feketukadoz/bFYVheQ/22355636485.pdfIn PDF document text
    • https://site-1175908.mozfiles.com/files/1175908/30113117836.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/jaworikefikafug_fitedunuk.pdfIn PDF document text
    • https://site-1168535.mozfiles.com/files/1168535/71697602897.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/1qyOiba/56075649465.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/1wp1Eha/gmail_app_password_recovery.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/HBmhjii/zarudopafufo.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/1168010.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/SibhjfC/disneyland_park_california_map.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/gdyEVGU/givex.pdfIn PDF document text
    • https://site-1171785.mozfiles.com/files/1171785/velavijipojafaxopab.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/gjO3hgA/89258132855.pdfIn PDF document text
    • https://site-1175236.mozfiles.com/files/1175236/83076992536.pdfIn PDF document text
    • https://site-1171149.mozfiles.com/files/1171149/sogelanumitabizuganup.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/gfJmPa7/photomath_camera_calculator_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00023d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D78 5132 bytes
SHA-256: da007cb73d4a7c6fbd1abd2c9cbdf00f4f56b9ea11a2d2caa713376522f48187
font_01_sfnt_off00024eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24ECA 16336 bytes
SHA-256: 4e13ab2e6be91986266cfa4515748a0a88a39ee83e5090905d07bf99b0bcf7e3
font_02_sfnt_off0002807e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2807E 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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