Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ee89d5f28689af…

MALICIOUS

PDF

70.2 KB Created: 2021-05-18 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66b773d9de46cf2f98e71a85a7e19f78 SHA-1: 81931d41a6e60cb3204594b07c1a40af81d46291 SHA-256: c8ee89d5f28689af12761435ec4e45f443f053538d41b3fbc2818b249fba10d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://ponafet.ru/strik?utm_term=program+xr2+remote+to+motorola+cable+box PDF link annotation
    • https://zunelejodimoje.weebly.com/uploads/1/3/4/5/134526095/pufowibunotopev_gukilifujibodiv_xifixugux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_6047806dee4e4.pdfIn PDF document text
    • https://pesefusuf.weebly.com/uploads/1/3/4/4/134486856/lujuvuvobibewe_pusopufovopu.pdfIn PDF document text
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/9648621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499622/normal_5fd19b6f42566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc732ad77058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_6018d30628de6.pdfIn PDF document text
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/dd2e6e6379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_604f57e8b087f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5ffc165d0179a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5ffb9ed0dc0f0.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/rasitavulaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/149c3876-5cb3-4211-9518-5a948927f677/adaptive_features_of_aquatic_plants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad0deaf-1577-43ef-b040-c2b75ea0a049/ni_executive_covid_19_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f45020-41c9-4598-a27b-75a9ee10ff7a/love_warrior_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/older_snapper_self_propelled_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/bticino_classe_300x13e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1e1f5d-889c-4736-ae44-cfedb85bfaff/24385799976.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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 5280 bytes
SHA-256: 091340296ad1104832b1fab028e8f0c5a830b6ffe0753dc5d7ac11506e7e3add
font_01_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 10000 bytes
SHA-256: db8d8c0b104cd019be1ec981317b58c388fe4e4da602efff184d40ac9f36fc52

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