Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13147235dc80cd9…

MALICIOUS

PDF

72.0 KB Created: 2021-02-12 19:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ca8464454f18739aa44d5e9ef3f9271e SHA-1: b0937d0745600f5176fe0d048a63e77a848abbff SHA-256: f13147235dc80cd94dbf0c7e23b645f00ea8298f7060696868a2081268963ba2
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://crophysi.ru/123?utm_term=is+showbox+safe+reddit`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=is+showbox+safe+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe883714d486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5fd103a112a7a.pdfIn PDF document text
    • http://lnstagram-office.com/xamalez44u4.pdfIn PDF document text
    • https://lupoxever.weebly.com/uploads/1/3/1/4/131413766/rulefutulozelerira.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/517080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5feb517e0c597.pdfIn PDF document text
    • http://semengergel.ru/6652008032598g1o.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/f8DMtuV/fewuraxokumebevibopuken.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/ffjbijP/running_shoes_for_flat_feet_nike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_600fac5926675.pdfIn PDF document text
    • http://uniques.space/30994212109wcnen.pdfIn PDF document text
    • http://topsalon.xyz/metovemigafuwoxuzus97am.pdfIn PDF document text
    • http://bas-vorota.ru/laporan_praktikum_medan_magnetqoh51.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/lE6ihhh/rifopobazenefolelikara.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/tomaxade/protect_a_worksheet_in_excel_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/64502192832.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/93023407007.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/waludono.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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 5200 bytes
SHA-256: 2e29e119c27a775595d2b9e0c0a908c2dec237ff8f45d2875861e94fb0407b4a
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 10888 bytes
SHA-256: 09fffe4feb4a882635f6babbfd76af56ea81e99a5390b5a01b3038e40aeed295

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