Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7175e894c74265d…

MALICIOUS

PDF

110.9 KB Created: 2021-03-27 18:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4173c80a258de5f7a4c013bfd60076c0 SHA-1: 7b9f5a18f3b7d8b37ad0f4f34427a77e07ea49e2 SHA-256: b7175e894c74265d32dba72ef28bbb37272fe04a43e3676c4c1ddcdaaf27787d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain metadata related to its generation, suggesting it's a lure document designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=what+does+general+systems+theory+mean In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_600e67e9b55ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5fd1b14f88a06.pdfIn PDF document text
    • http://kvrovk.xyz/research_methodology_vs_research_methodsaipyx.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/how_to_calculate_interest_on_loan_in_nigeria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_6046344cdafee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_60533d258b2c9.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/how_to_download_pebble_watch_faces.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/56717061611.pdfIn PDF document text
    • http://sportita.fun/konica_minolta_bizhub_c258_driver_macn0xu1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5fdcc74c189d9.pdfIn PDF document text
    • http://kihepc.xyz/event_schedule_template_powerpointfsz2j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_60482542db0b5.pdfIn PDF document text
    • http://leaninrzpd.site/164306136781g91i.pdfIn PDF document text
    • http://usecabinets.xyz/70703702343dex3t.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/1970_ford_mustang_mach_1_428_cobra_jet_value.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_60426e91cfec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6057a90e53cb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fccffeb9a167.pdfIn PDF document text
    • http://avto-trokot.xyz/cricut_expression_2_cartridge_error_3iqdgv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_5fdbb2ba1ef1d.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5fe13d8384969.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FE 5352 bytes
SHA-256: 59bbf2d90af0b3da0c31021fe699a8a43677651dba48ed397f7c06a25d58ce2f
font_01_sfnt_off0001841a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1841A 13316 bytes
SHA-256: 3c3eb8e9daabcf7e8f1ea55788677b82240a75430b304ce0e812dfbcf374b7d9

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