Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55ec506d018314d…

MALICIOUS

PDF

73.0 KB Created: 2021-03-08 14:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4eec4f2aacc3c745a17a7b19dfe96214 SHA-1: bf8a745aba67d76ffbe849ba972a7e7f7f840fef SHA-256: d55ec506d018314ddbabd16113e0dfde160890a2ceb2de7f5b4260fde031af1e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various platforms, suggesting a link farm designed to distribute malicious content or phish users. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and is flagged by ML classifiers as malicious. The ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=adversarial+attacks+on+medical+machine+learning+pdf In PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/5029d650f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5fe1829839d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fc9d9a1765b9.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/9db9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5fcea44777358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_6043d82bd2a9e.pdfIn PDF document text
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/e21f02ef9007245.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/cjfdxm6/kejubudomowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373770/normal_5fed9646816ae.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/2124579.pdfIn PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/garosigotifonurafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5feb0ddc13590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_6024270a8a60e.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/he7hd8X/88922306279.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/17iimgz/sniper_ghost_warrior_3_system_requirements_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/dWuZdoR/mlb_playoffs_2020_bracket_predictions.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/Ftjjjh4/granny_s_kitchen_menu_hot_springs_ar.pdfIn PDF document text
    • https://tugivopufik.weebly.com/uploads/1/3/4/3/134348802/jipobinunipugekome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5fee97e701fca.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/2034675.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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 5680 bytes
SHA-256: a8ddb1792138b0cdfc7b829b3feaa06fc0a120949b2629277eb82fc2f7d8aae9
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 10420 bytes
SHA-256: db0d62440d5bdccfcbb3698e19ec7c2ea4eea815b53a1f3686089a99dce444ca

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