Malicious PDF — malware analysis report

Static analysis result for SHA-256 881e0f8457e16e7b…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 09:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5df1ce0a1f609e9d14872883353b04aa SHA-1: 47c64a8829da0dba97cdcf840276ec1b6d7ada87 SHA-256: 881e0f8457e16e7bc9d10f6365e0406ea6134f09637d51ad62a0b5ff6ffc886f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection for malicious campaigns.

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
  • 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://lozipotod.ru/strik?utm_term=is+dmso+good+for+knee+pain PDF link annotation
    • http://bluhgang.best/wifi_smart_camera_v380_price_in_pakistan1pxk1.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/djiepTe/30556834112.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/hggjghf/yandex_money_english.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/78881122524.pdfIn PDF document text
    • http://trendmobile.ru/616788678259pk9s.pdfIn PDF document text
    • http://unreguezff.rest/jifopafoiwk2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_602061408f2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_602c8c56f267b.pdfIn PDF document text
    • https://cdn.sqhk.co/bigokukanuf/4gcOchd/mutupaxevifo.pdfIn PDF document text
    • http://slamelina.website/57237284172jfd7u.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/3pnQZHD/9177870418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_602683314c873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulumasofip.epizy.com/swiftkey_vs_gboard_performance.pdfIn PDF document text
    • http://fanutebuxus.rf.gd/gamefowl_breeders_manual_and_cockers_guide.pdfIn PDF document text
    • http://tamugaza.rf.gd/flip_video_camera_software_for_mac.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5328 bytes
SHA-256: 76dba325c9bbdf4c5e940a4200d93744d834e9e20225b5779a976d3be39bd906
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 10104 bytes
SHA-256: cc1fc832e8e7f3241381aeb4c93cf641f70b35fd7e656e8df2f61d6632aa9bef

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