Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1257b5041533da…

MALICIOUS

PDF

72.6 KB Created: 2021-05-26 15:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4df73d7e40626fad43426de8d290b946 SHA-1: c10528991877184aa85ec5fd8763228504fe9f8e SHA-256: bf1257b5041533dad45d85c0b61feea249eb3d802fc6016ece5e7a4674546c6d
186 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 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://fokemale.ru/strik?utm_term=dell+inspiron+15+5000+series+wifi+driver+for+windows+10 PDF link annotation
    • https://xabuwizadapipuw.weebly.com/uploads/1/3/4/3/134351583/fedevuv.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/ruwuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_6002639d8484b.pdfIn PDF document text
    • https://feruvemigik.weebly.com/uploads/1/3/4/6/134693586/991f8790d4.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/jizusanuwavexe.pdfIn PDF document text
    • https://peretokat.weebly.com/uploads/1/3/4/0/134040551/6c42310220b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_604ad47f9780e.pdfIn PDF document text
    • https://jurikinala.weebly.com/uploads/1/3/1/6/131636618/11138.pdfIn PDF document text
    • https://waxusebodik.weebly.com/uploads/1/3/4/5/134529962/pijevikulosotuf.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/bb583766-80a6-4c52-ab8c-de7fa10539fe/imam_ghazali_books_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980cf660-791e-4b48-bd2e-6c3935391764/javozemivoxebofafutoboru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8492aa2f-0b12-440d-9bba-034744dee951/62391351903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78a85a5-ebf9-4fc2-bb2e-c2123369b3ee/93086979254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f556a992-1e3a-4aea-a498-3b6e6932a93f/korean_grammar_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b183f12e-a149-4bdb-ac68-67435ab1d0c8/msi_h81m-p33_overclock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2985b51-0d18-4543-8437-d0c174b7d17e/blomberg_fridge_parts_canada.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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 5292 bytes
SHA-256: 92f27635840cb7824e23c0a180debfbce035255da70af79a4e831d3716b02b4c
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 11076 bytes
SHA-256: f32a45426e9b205b46ecc1b485b514e7ed5fef740625a455a2d24eaa684345e9

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