Malicious PDF — malware analysis report

Static analysis result for SHA-256 9428a5310d9f2bce…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 21:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ea3fe1b7da289372a349f6af53a055d5 SHA-1: cc3cb1b035d3b5994d89e9f2096113aca1f81cd7 SHA-256: 9428a5310d9f2bce67300a558a5afcd0156e018fe8d225fd506576f91ca05401
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 services, and the document body mentions 'cheat engine for pc uptodown', suggesting a lure for software downloads. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

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://botokaw.ru/123?utm_term=cheat+engine++for+pc+uptodown PDF link annotation
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/d022e0a.pdfIn PDF document text
    • https://jotipipadazazo.weebly.com/uploads/1/3/4/3/134319758/pagijinimipu.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/introductory_mathematical_analysis_for_business_economics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_60503a86bfbe5.pdfIn PDF document text
    • http://kajipim.mypressonline.com/24920535221.pdfIn PDF document text
    • http://visionnew.xyz/56661706338d7ewk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fda465325eba.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/kowonegezugavus-joxowez.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/9574503.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/1bf4454d2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_601aeeeee1f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_6029eb1508737.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/84956bc1bfd2.pdfIn PDF document text
    • https://marodesama.weebly.com/uploads/1/3/5/3/135349202/demaf.pdfIn PDF document text
    • http://naligixe.getenjoyment.net/robitil.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/negoxotusibuvifag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_601ad233c00ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_600f64ce78b26.pdfIn PDF document text
    • http://stroymarketmetal.ru/aestivation_hibernation_differentiationnc5wz.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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 5204 bytes
SHA-256: 27cfe00ad6217f9a758fc5577d40a3ca1627ee2332199cd0f919591aaafbc012
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10828 bytes
SHA-256: d5f4b7fe0743f37410323d9206d083028f9d5bb76820b6cb1c9c41c6d1891960

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