Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b77857bcabe8971…

MALICIOUS

PDF

82.7 KB Created: 2021-04-13 19:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8bf77f6d54889d4ae892a0ac3dd1967 SHA-1: 5592ffa245c8a44b96ad8a3107d84966a328fd3c SHA-256: 0b77857bcabe897192c7f1541c117c082d5f5a5cac0e2fcb222e165b6b118995
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 0.9997

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=what+type+of+printer+is+the+hp+envy+4500 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd67265717c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_604890f2d2256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_60176b07c01f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_5fdc3e183702f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6037c3cc8ec4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_8018f2052f1b447f85c51408ba713aba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15bf852-b3c8-4b93-9195-c27d7959f7e1/jikulajaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ed288b-2254-4834-954c-0f51382b083b/how_to_reduce_shoreline_erosion.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_e4f2df7dd4f24895b0922024eace76b2.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_3fc2defa2c0e425ba52118b43009f021.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_f8df3bde4d2b4099b77249ddbc68b37f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/deepak_chopra_daughter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c8ff49-14da-4cdc-83b7-07968172848a/66661923855.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/knights_of_cups_tarot_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/how_to_reset_pioneer_stereo.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_c16dd9d5ed4942c3acb49d5f68910d66.pdf?index=trueIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_400d218f86bf4aee85b47631c4cfbca0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/97953455486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fc8a6e-5a84-4465-8e0c-80df1f70295c/what_undertones_are_in_mindful_gray.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/exhibition_invitation_email_template.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_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 5484 bytes
SHA-256: 845d057f46458ccb151cbdb86559c813946c28f58da9c3017abd53e02fcf9b74
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 10728 bytes
SHA-256: cfd942deb34df8f12147b0151942e6d921a50bacfc1c3f04176f590d8173916b

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