Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab44dbd68811330c…

MALICIOUS

PDF

73.5 KB Created: 2020-12-11 07:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7c295d1b94ebcbca4c04821614a492b SHA-1: 60570a01d9d634aae88d03f95a568eec684fbbff SHA-256: ab44dbd68811330c5f9353431ed769e256e0c54bf50441763d1de99b97c08662
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the document's structure and embedded URLs point towards malicious redirection.

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://trafftec.ru/strik?utm_term=fish+tycoon+breeding+greenfin+spotanus PDF link annotation
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/kerol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5fc4d0e479632.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/tojigerudufiw.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/11694e97b.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/nagasutepuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_5faf9d9f8d0c8.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/d67c7c4.pdfIn PDF document text
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/fuleza.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/sugifafirupid.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/zibawej_burepojil_baxatazixivug.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/sixenogafopoj/goxasejupebowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a91f93e-34b4-4d3e-920f-edcc47c87e85/76374365845.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/videoder_free_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b281f849-36ab-4a00-b3e1-139a1c15e974/68875559107.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 5580 bytes
SHA-256: 605d3687495d9bcaeaee01d683b88ddcd5020069b0911bc8d92c866a7f0604af
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 11652 bytes
SHA-256: 50054a95f29f6555cdb62d357bc2cdbbebd85992d978f9f0ffd96d843d593003

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