Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcc7da6e4336d91…

MALICIOUS

PDF

74.4 KB Created: 2021-03-19 14:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02971cf9ef3e124478e7fea01302f708 SHA-1: 92c0edb7cddb7f92ee1991eaebffe7037851af48 SHA-256: 8bcc7da6e4336d91e4fc06f958f45abfece22226bd297b43f90ffe504d5f76c9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=dodge+stratus+2006+battery+cost PDF link annotation
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/49522.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/ihgeRYe/pokamonewaguzuwarofirove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_6027f1ae20013.pdfIn PDF document text
    • https://fosewawigikutuw.weebly.com/uploads/1/3/1/8/131871484/wimolagirufisot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe6e34c6b2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jijcWmJ/46678474508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fcf5bb9ae179.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/numunenoji/pedebojafavikexok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8092e98d-35ab-4a04-af54-9ffe24a331b5/43004257855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1173d81-eed8-4b78-949f-c65a01dc7030/89719597732.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/49692228846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797b8afe-f25c-4761-ade3-ea3c0618fad6/pirates_of_the_caribbean_piano_music_sheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/bacteriologa_clinica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68528197-fcfd-4518-8c98-ea915e3e1af4/busufaxilijujurijex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b37cbde-ee45-4ee8-9d04-94ecf9c18747/safikenojoxawegokuvuzij.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_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 5744 bytes
SHA-256: 61c97a46910576084f82747a41e473a9a5de26cdf3f484f80fbd07338921ebaf
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 10932 bytes
SHA-256: 0a898e4d45db505d08a8b79bb4de19c05d8ee3fcd5cce239293ee82164b62544

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