Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f589c818da7b7…

MALICIOUS

PDF

83.7 KB Created: 2021-02-19 00:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4a191dbc2b53bbfacfb3e01c7de59a1f SHA-1: 1b960a49a3b4feeea8f28cf27b29914756b0a730 SHA-256: 907f589c818da7b7140a4915568a1b3c63e1b6874614c3a925f57d2c8a540d5b
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/strik?utm_term=evenflo+chase+lx+harnessed+booster+car+seat+canada', are designed to lead users to potentially harmful websites. The document also contains numerous other links hosted on disposable domains, suggesting a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=evenflo+chase+lx+harnessed+booster+car+seat+canada In PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6002a7df91c51.pdfIn PDF document text
    • http://yesnutural.space/gedebanoxujultm740.pdfIn PDF document text
    • http://gakmancreatures.ru/need_service_name_for_build-arg_opti3i1bi.pdfIn PDF document text
    • http://wersita.fun/bd_chaurasia_anatomyni3jj.pdfIn PDF document text
    • http://lepegumokolato.iblogger.org/into_the_spider_verse_soundtrack.pdfIn PDF document text
    • http://peskomment.ru/xanuviwokifekefoxuxile3iex4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483081/normal_5fe157280c2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fda3358a3a38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412767/normal_5fefbcd3a8576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://togipumenotu.epizy.com/fridge_temperature_template.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/lighting_effect_vector_free.pdfIn PDF document text
    • http://gesuposobevexo.rf.gd/building_quote_template_excel.pdfIn PDF document text
    • http://tatoguninorevem.epizy.com/banished_early_game_guide.pdfIn PDF document text
    • http://juwelaloz.epizy.com/pediatric_hypertension_guidelines_2018.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/bookworm_adventure_crack.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_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 5332 bytes
SHA-256: 73872f2db89d801b21ee77a53dbdf23b2373496199f89cd4c1e0bd89452ba7ba
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10624 bytes
SHA-256: db3e21b78c62c1934ae618ebf0bf81498ff2469600ec6801d558ed2ba3f09de7