Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c1e10206408094…

MALICIOUS

PDF

87.1 KB Created: 2021-02-28 07:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5fe2b9d7cafc7257c2a6dc458b213645 SHA-1: 9fb68738cefca480e0dbf9d41cd1c3938f76775c SHA-256: 45c1e102064080944ecf5df094fe7bf027fb11857009ec1166cff8e5bc64fe73
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, disguised as a 'chemistry answer key'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit vulnerabilities or redirect users to malicious sites, likely involving client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=chemistry+answer+key+2020+karnataka+board In PDF document text
    • http://zufudaduj.iblogger.org/19422168300.pdfIn PDF document text
    • http://twobigs.space/23688517852xth1i.pdfIn PDF document text
    • http://soul-felt.com/xylo_bgc_eventstoq25.pdfIn PDF document text
    • http://goodnaturak.space/mastering_r_for_quantitative_finance_downloadwnr0n.pdfIn PDF document text
    • http://xuzugukow.iblogger.org/bunavezaxudonanolovu.pdfIn PDF document text
    • http://pipvip.ru/5484565446zjr9g.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/bhaidZ9/final_fantasy_16_trailer.pdfIn PDF document text
    • http://deutschebank-meine.com/3452472848d8kzf.pdfIn PDF document text
    • http://ionatr.fun/9478537171z3zr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/xifopizum.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/71830315592.pdfIn PDF document text
    • http://durunorutap.epizy.com/cambium_e410_manual.pdfIn PDF document text
    • http://xijisunuma.rf.gd/common_core_standards_math_2nd_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/37880739178.pdfIn PDF document text
    • http://tuzawuza.epizy.com/64649612256.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 5516 bytes
SHA-256: 84e2a75fa206cd0065a599fca76e2a27e8d5038f4448d89dc538ed016befc311
font_01_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 11584 bytes
SHA-256: ca288c4d371fdaf12ec8137dd7fce86d807ef45c40d303ad911cd9f34f126b5d
font_02_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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