Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bac7db2391dbd4…

MALICIOUS

PDF

70.3 KB Created: 2021-03-09 17:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c45353e2ab92bb6654da0913fd6c28c9 SHA-1: d3b73ec4f9b550e6fc57fdb7a7b435e37c29837c SHA-256: 10bac7db2391dbd4c2a7ae92a08cf06c2b957b32e7f89154e8bd77106817957c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=in+the+bleak+midwinter+sheet+music+darke PDF link annotation
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/9979449.pdfIn PDF document text
    • http://lazerepil.site/zupos8s3lk.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/vegan_cookbooks_for_beginners.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/86643251250.pdfIn PDF document text
    • http://uscreditinquiry.info/soxatamasazilisekibaz2ov61.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/wubujexetirofofu.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/wuwexip.pdfIn PDF document text
    • http://domavera.ru/citation_mla_format_book8g8w5.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/rutavusuzanixa.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/gasupata.pdfIn PDF document text
    • http://best-store.club/possessive_pronouns_worksheets_for_grade_5jr0xu.pdfIn PDF document text
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/nexudigekot.pdfIn PDF document text
    • http://sreda.city/cuisinart_electric_pressure_cooker_cpc-600_manual2bdjk.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/xisefowu/how_to_use_canva_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/42894759808.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/38306223116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8a8ba3-fcb5-47ae-a5fa-050b15f3e7ea/27427926432.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/sepurotuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21aeeada-757f-4db8-8b0a-513eaf00b3f9/kimoronegopawipeno.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/f-_stecker_richtig_montieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f2c60f-c294-46ee-a707-c06924d1f22a/11012139357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2938de2e-11d3-493c-bb2a-e7a96823c1c2/small_engine_repair_course_online_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/91505075763.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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 5412 bytes
SHA-256: c9dfe45bfd0608e78bb62144505f11bceabbd4fc1e540c6b5690e88b908da123
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 10548 bytes
SHA-256: 6f4bfbc9905d211fb61b36ac42b0537f4678232e3ba8bc182fce0c3948bef624

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