Malicious PDF — malware analysis report

Static analysis result for SHA-256 9673fe923a11e5dd…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 14:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 449f77276e97d971128ad592ef822e18 SHA-1: 70be592fc5cc3311ce1f251895ffdaacc2c3433a SHA-256: 9673fe923a11e5ddac5e98c55992e1f38b59000d983fa7598fc97ac82a638e1b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or unknown domains, indicating a link farm for SEO manipulation or malicious distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=101+uses+for+avon+skin+so+soft+bath+oil PDF link annotation
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/fe5eaa4b8.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/ZIEGhh1/agnes_monica_teruskanlah.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/dfjjCgf/dadix.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/hiMPFin/43424048375.pdfIn PDF document text
    • http://hookup671.site/how_to_cancel_call_forward_on_nortel_phoned0bpu.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/wQ4DjjW/povilerimibewokolemuzo.pdfIn PDF document text
    • http://smeshnoykir.space/game_dev_tycoon_android_combinations59sw0.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/97460536901.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/4550850255.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/5783959.pdfIn PDF document text
    • https://vapigoje.weebly.com/uploads/1/3/5/3/135391726/musajapawuta-mosisewejiriti-tetumenakibik-wawimitoxi.pdfIn PDF document text
    • http://italy50wow.pro/how_to_add_foxit_reader_printerzkcfg.pdfIn PDF document text
    • http://milanbeachs.space/16030515406gzb7u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_f0093cb1d27242adacf3ee08f88c79eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fad6f1e-8b42-423d-9693-34b45d0a0846/62111175855.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_5cc0e78ea9cf4923b0cba89f78b9948e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ca1f52-41d7-4a86-8098-edf7d23d22c0/amusing_the_million_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ace964d-ba67-4524-b310-1ea960cde943/rugoxeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75880a33-763f-41e4-8459-6fa77ebbaec3/lareretofalisufuxuwagabid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7a1869-56d3-4b52-b30e-de0232a7d24b/trimble_business_center_system_requirements.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 5220 bytes
SHA-256: b6920e5e29f409b67e6d5c8c701f9c3fb4ddc5bfd387a898cad9a37a15d9c3d3
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 10916 bytes
SHA-256: 7b7d87efefa2bf29ebda9c8bde7ef9959b2464ceddc86a8451f89af417c7490e