Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bfc4984d78112c…

MALICIOUS

PDF

80.9 KB Created: 2021-03-12 19:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 97c2848b72e548429fe8bab00e8a43ba SHA-1: 281c30d8d379c575d580c7735814087a22ca5f83 SHA-256: b4bfc4984d78112cb724c71da191184f8fba5ef9714f511d88080579a04f58cf
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link to a known malicious domain. The ML classifier also strongly flagged the PDF. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests a phishing or redirection attempt. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=reliability+engineering+tools.+pdf In PDF document text
    • http://euromarket.pro/how_much_is_a_srt_hellcat_chargerhyb87.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/rPPPigk/fujunivosodelokujo.pdfIn PDF document text
    • http://beststudent.fun/86461959016qpqeb.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/1014533.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/haihjh0/46079568816.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/6514026.pdfIn PDF document text
    • http://itasda.online/chinese_embassy_nz_visa_application_formx6rdl.pdfIn PDF document text
    • https://zeduwekikozive.weebly.com/uploads/1/3/6/0/136050246/88b9b58ed22aafc.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/dugobomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_601a1bc527eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_60110faacd780.pdfIn PDF document text
    • https://rezopagukivuru.weebly.com/uploads/1/3/5/3/135307961/38bcbff3f338973.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/xYghfDg/ludus_latrunculi_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zowibatev/assassin_s_creed_origins_guide_papyrus.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/94149320470.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_71aa6ef01c904e19b9b309041f650f1a.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_d24aa81216a142b79f5c6d7d46639df9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/planning_for_personal_development_plan_examples_professional.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_e984fc8bd6b04c8d9be1f528014c8b43.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_3af287fd5f2f4362978a5eb558b32b78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/18705755313.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_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 5488 bytes
SHA-256: 086520fd4c0edcc6d6de052d380386a5af0c9e1f64050ef4beb8c192eeff13ae
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 10240 bytes
SHA-256: 454c83852d4a77ea5aec7e14c97edcc99e2953b8d4657dce350431e6ab1285fc

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