Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c66bbaf39b4750…

MALICIOUS

PDF

71.8 KB Created: 2021-02-06 13:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 3f658ab9a6a37b0c3aa47ad1bbd450a9 SHA-1: 00adb8ff6c6b7d683bbd5198a217c439f684bb31 SHA-256: 12c66bbaf39b475080f95201dcfe531cdebeec126c1082a854acb21a261a56d9
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wb?keyword=organic%20chemistry%20textbook%20for%20secondary%20school%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6012db6a4e7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/hjrEihF/hide_all_file_extensions_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffe469095d85.pdfIn PDF document text
    • http://menavuselixeba.iblogger.org/ketaledife.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/zamuwemefetakuvi.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/8021428.pdfIn PDF document text
    • http://dakixofib.22web.org/65463219000.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/8efc839df81.pdfIn PDF document text
    • https://wufowidujexo.weebly.com/uploads/1/3/5/2/135293423/631806f8cfb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_6007d26a19cf6.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/gegigS9/modern_warfare_3_remastered_ps4_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/Biahagf/14820385840.pdfIn PDF document text
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/9762007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borovob.epizy.com/zufozibev.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/51388997496.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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 5968 bytes
SHA-256: a2c07a7748ac383e8d8cde1c665bba580edc6db9ee19f11466d1c100a4a0dab9
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 11304 bytes
SHA-256: 0967ac1426a0d4910af7f40d971b99043022e6d690abe4f289b570a0f38f392d

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