Malicious PDF — malware analysis report

Static analysis result for SHA-256 3056cff55e29a879…

MALICIOUS

PDF

73.8 KB Created: 2021-06-03 13:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6341a6815faeaff69cc62185b5f5acf0 SHA-1: 3242cacdffe15fa0d1f1a3f0c5360b4f5bbbac00 SHA-256: 3056cff55e29a8794838ba3914dea68820ff7884cf8c4b14d70cfeff16daf9ad
186 Risk Score

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 0.9993

Heuristics 6

  • 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.
  • 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://krisoc.ru/pbw?utm_term=what+are+the+six+approaches+to+conflict+resolution PDF link annotation
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/xoruzugokazugol.pdfIn PDF document text
    • https://panodetis.weebly.com/uploads/1/3/4/6/134669877/3c75bf8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_606bd5891262c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_60238340bcc60.pdfIn PDF document text
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/judude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_6001772e74b3c.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/pisoxowiguka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd63b1a3026d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6062fb1bdc2b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_604cb84829eeb.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/xotupan.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/mapolobidugodem.pdfIn PDF document text
    • https://tivifetanesa.weebly.com/uploads/1/3/5/3/135347176/3610f42e735f8c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6048610b27494.pdfIn PDF document text
    • https://nilezejexi.weebly.com/uploads/1/3/4/7/134737846/463f7ab7.pdfIn PDF document text
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/mipelonag_nitakazajiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viluxese.pbworks.com/f/57930306757.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/fekav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b066b7c-92d5-4ba1-9b1f-825151c022c5/drive_right_chapter_12_workbook_answers.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144541608/netazukabanebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ecf0f8-caa6-42be-a55d-d46b8019333e/treasure_island_hardback_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514cf378-8074-45c4-8f6a-08b5e5b21f0c/reformas_borbonicas_consecuencias_culturales.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144423726/homophones_lesson_plan_grade_4.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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 5184 bytes
SHA-256: fe51bb7b33d17cd14e2bd537bc9bc6a255b938f9a6da9ae13fa3b6f2815adb5a
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 10376 bytes
SHA-256: 396c8a5115d4a5868dbee05ea494c683cdb84a87e8379674c9264d6d4ce728df