Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74842c7544bff00…

MALICIOUS

PDF

77.0 KB Created: 2020-11-29 14:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cbcf11638e1acf9623e876663abb1a82 SHA-1: b51608e9805a140a8539424e0ee19763faeaab68 SHA-256: d74842c7544bff00d9f16785336955808e0c1a69745f72954162c3d11bba028e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric or use generic slugs, indicative of a link farm designed to manipulate search engine results. One of the primary external links, 'https://trafftec.ru/strik?utm_term=who+moved+my+cheese+ppt+free+download', suggests a lure related to a popular business book, likely to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://trafftec.ru/strik?utm_term=who+moved+my+cheese+ppt+free+download PDF link annotation
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/bagifesanoni-xirosowanaka-gedivolasolite-xitakatefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448331/normal_5fb49cb89fbed.pdfIn PDF document text
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/a8adb61121e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5fa26bc3aef46.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/32361e43-3fa9-4a11-bc16-29c374f06f92/68803661642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35676dfc-bdaf-44e5-964c-2b3f9c262dbf/fasud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a7e259-c194-4c50-b9e5-41a3866eebc4/formulario_de_un_club_deportivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4664867c-f095-4000-8fce-2e920aa25ff9/rubugalazevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e09427-93b7-4616-819b-aaa0bceb49a7/como_instalar_autocad_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d092a2-faf4-4b09-ae5d-baa3b70af142/63471001009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76768482-3fef-4a4d-9ae1-e05e7194abf7/fafopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2727260-8a9d-40f0-bc8d-a81e2c1ba9a6/kodadiregavuxuninewobafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb281e1f-11f0-4619-829c-30f6ca6ffb99/53026148830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445724a1-6d18-47b2-8a3b-b9dca2c97245/sususimunosiresofekow.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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5660 bytes
SHA-256: 1853b1c9fca31df7efa220ea833ce55834f836abe4e39388df47845e5f27460a
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 11432 bytes
SHA-256: b74c9b6589957ff0711574462457d9f38c1af192c1d7269f5313da69f1b4dedc

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