Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e71025a6dd6f2d…

MALICIOUS

PDF

68.6 KB Created: 2020-12-31 19:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31c5fe3b6f94b8a0259fa9dcd6c67551 SHA-1: f0b2004b1e3b3c103f0e3f27efa4082ef0de9aa2 SHA-256: 49e71025a6dd6f2d9dddb72bc3308a214bf5aa1b034e3b11d6b261f217726bc5
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, with a primary suspicious URL pointing to 'trafffe.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

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 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://trafffe.ru/strik?utm_term=movie+maker+windows+10+pro PDF link annotation
    • https://cdn.sqhk.co/fakobijo/hjh8Sje/55021340961.pdfIn PDF document text
    • https://cdn.sqhk.co/fepixuzutol/CPCpgi0/88648868193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_5fbf07e91b819.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/kulikobofibugas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5fc44f99acbf3.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/3021d77e-8d64-415e-a3cc-526518930299/concise_inorganic_chemistry_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1b29a2-e1e2-47d1-b14e-4d5b6c56a746/live_chat_american_express_travel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a04cdf7-f21b-419b-a480-8d34164780a5/52722133096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16aa0646-9b6d-4477-af0a-f3875f05ee55/36398598639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7018ac4-9b1a-4da0-9897-4f0e69da1d0e/91116299797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f971cbdf-feb7-45a7-8bb4-d3f66bbf71e7/best_tiles_for_bathroom_walls_and_floors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100a64bd-e4dd-4044-99ce-ab8fa6570a51/free_kindergarten_sight_words_worksheets.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_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 5488 bytes
SHA-256: cad3b70c0849f981e4fdcced99a62aea8446490f29287dd7f3c24ad1a419b1c9
font_01_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10404 bytes
SHA-256: 5dadf0fa1fb306f33184e30bb2928bc2b718ec7a9fe3df1e8173e16e18ba67de

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