Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0572d0ed69f5031…

MALICIOUS

PDF

76.8 KB Created: 2021-04-17 01:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 813bce9f14223c04f7ca30e8e13c5117 SHA-1: 8237f08558a4e2513414682d43f8ab7b19e06d26 SHA-256: a0572d0ed69f503181fb3a1a859546d2cf78d00e59fa70337e7eaa34f63d7851
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://maypoin.ru/strik?utm_term=what+does+off+the+boat+mean+slang PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418786/normal_60375920c1bf8.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/mbjdYkU/83713823059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_600a9c498d97f.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/hbhjMgj/29267174432.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/19155922959.pdfIn PDF document text
    • http://pubgucbayim.com/moonshades_lever_puzzleqtqjr.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/gdjiagg/55698098803.pdfIn PDF document text
    • http://bravos-kids.ru/pdf_english_grammar_book_in_urduhcdfk.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/antisense_technology.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fe2d3e895171.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/13306797829.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/nanomutalararifuriferar.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/73684745088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_603053bae5ed0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fararisujis.myartsonline.com/bodukixobajolaxexepaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/certificate_of_origin_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/87955226165.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_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 5376 bytes
SHA-256: 26ca277162d1aecc73777a591188e495b719979e3dcb0c9d2eaff1e2f2462ba0
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 11304 bytes
SHA-256: 2355e0e00924f085fb07754dfd30ecf1af63421da22e4d2f00dd3dca0e4e5b2a

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