Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a83396a50ebf4f…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 14:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 33766f4487b08bf13db8fbfec524879b SHA-1: 9dc2124fcc4a57213f2e64c561192d146f8c0ea5 SHA-256: f1a83396a50ebf4f452bd7374a5cdd236ae1000a71782014bf6dfcf1152fb034
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wix?keyword=imagery+examples+in+catcher+in+the+rye In PDF document text
    • http://usacreditcheck.info/whatsapp_stickers_maker_apkh5rcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fdc6c467e71a.pdfIn PDF document text
    • http://cashtanks.fun/36862097108ep813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6016c8ef68fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_5fe80ab92cf92.pdfIn PDF document text
    • http://demask.space/rulugorirzcuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5fd6a16034346.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/ieibNWo/24443821679.pdfIn PDF document text
    • http://sadipetuzaw.iblogger.org/18151883982.pdfIn PDF document text
    • http://noncomform.space/phoenix_wright_games_rankedfcqha.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5fffa537d11d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600c7abb5c9b4.pdfIn PDF document text
    • http://1freedom.space/deus_ex_mankind_divided_steam_achievements_guidee9wl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_6031c800245a7.pdfIn PDF document text
    • https://zadoloxo.weebly.com/uploads/1/3/4/6/134602956/siraloburuvajuzajima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vetarobafawuk.epizy.com/8118850419.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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 5452 bytes
SHA-256: b7e8b0d7e3110375540ef3ae7234bca2baeb58235ee3dd6d2f9ecdbbc10bef19
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10148 bytes
SHA-256: 4139a9c6aa3745154346607726c44a38b0c6acb46e0a7f994e252aa7b3927357

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