Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25faa42acc6eaad…

MALICIOUS

PDF

80.0 KB Created: 2021-02-13 05:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ecb92bc4a171a90859ccada505837480 SHA-1: 5d69db32a2184a6e82b8471906e9d32c7d7b1e6d SHA-256: d25faa42acc6eaadf24eb4b11ef9f8e10790c46467dc5e9c7c91a0ff8bd2882b
166 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 0.9996

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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/123?utm_term=3rd+world+farmer+high+score PDF link annotation
    • http://fifuxuzod.iblogger.org/dictionnaire_informatique_anglais_franais_en_ligne.pdfIn PDF document text
    • http://com-login8.xyz/luwazojorokopej8mmu6.pdfIn PDF document text
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/buwizalewaru.pdfIn PDF document text
    • http://wtia.space/noticias_telemundo_52_los_angeleswu12b.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/gizetolapepojag.pdfIn PDF document text
    • http://groshyk.site/clip_sheet_traductiontxndq.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/8026060.pdfIn PDF document text
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/98b7390.pdfIn PDF document text
    • https://divisekul.weebly.com/uploads/1/3/5/3/135347680/0a958a36.pdfIn PDF document text
    • http://hookup757.fun/34318601134lv9cs.pdfIn PDF document text
    • http://proita.space/mariage_de_figaro_acte_5_scene_3nmarg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://mubaviz.epizy.com/64017607850.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/tibilosovagenimakabutegaw.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 4140 bytes
SHA-256: bacfb8e1f1595884a571975da0e41d6d871195ce3090ceeddcab69714719b0ba
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 5596 bytes
SHA-256: 7c384b7d0322471be60744bde3690a699d9af3392f6f382b99fd510acf239201
font_02_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 6296 bytes
SHA-256: dfd365b84536463aedeaa9eab142cfb17512beb6872eae4e3f256a3009ecb04c
font_03_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 11248 bytes
SHA-256: 906dc0a7d6577e31d407f68c032679da64724b2d46d66aa23a81394f477c1005