Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d1fc92d73f8bd2…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 06:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b810b80e881535eb18d0053f8db0b970 SHA-1: 906362378ed754a4d45cb778c21fbc85c4524713 SHA-256: 24d1fc92d73f8bd22d1bcd97f4a97c149f4730445730240d292734e4b84b0223
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://crophysi.ru/wix?keyword=dallas+isd+school+start'. The document's metadata and the presence of numerous links suggest it is part of a link farm designed to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=dallas+isd+school+start In PDF document text
    • http://pojekofa.iblogger.org/87258276434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_60237772c1f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fe697de04dfd.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/JhiijcK/mofafa.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/g66gf6k/krabat_and_the_sorcerer_s_mill.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/chdhgjj/10253129998.pdfIn PDF document text
    • http://7lessons.website/cait_fallout_4_voicepu1jx.pdfIn PDF document text
    • http://babysampler.com/vegimebas1v3cg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6036d24b9ec96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulilemol.epizy.com/88317740137.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/26376104324.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/zumun.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/ribunamezutopifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07dbf0d6-cbdc-49f5-bea3-213ca8f3f58c/moto_x_2nd_generation_flash_file.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/justice_tarot_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc9a201-b839-479f-a571-a511c0637bc4/why_does_my_freezer_not_freeze_properly.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5024 bytes
SHA-256: a1ff0813c94b9505612a21a660cece22a4aef5e1161c90cc0fb2b6bb34820fa7
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 10824 bytes
SHA-256: d04584f5661198ee30f78bd070def43b6e2907d470ca6340dd5b2ec84e466b22

Open this report in the interactive analyzer, or submit your own file for analysis.