Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fa116adf87a057…

MALICIOUS

PDF

64.7 KB Created: 2021-03-06 01:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 140844378653a8c4313c84613a443b7d SHA-1: 7fdcc0feed99df55bb76c6bea6030c11d9b5b524 SHA-256: 04fa116adf87a057ccc80dfb2d796858822e5a0e73bdf8563d304b88c92773f0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous external URIs, with one notable example being https://kuzutuzo.ru/award?keyword=suncast+automatic+hose+reel+parts, suggesting it functions as a link farm or phishing lure. The presence of embedded links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=suncast+automatic+hose+reel+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473656/normal_6019d8b823fd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_602feaa3e934b.pdfIn PDF document text
    • http://povar2020.site/email_asking_for_information_about_admissionnakrs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5ff35362b007f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5fce0bdf54604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_60215cea4660b.pdfIn PDF document text
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/511109349c64df4.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/lafumovojaruveb.pdfIn PDF document text
    • http://carbags.site/9107391895ltaw5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_5fdb6714b8d69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sakunesazodi.epizy.com/rowerego.pdfIn PDF document text
    • http://vifowas.epizy.com/pomabaresuvuwur.pdfIn PDF document text
    • http://lubudag.epizy.com/64601872276.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_86304ff5cebb41ad84d5d2e5bd233bac.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_8eb5f2cde95e4584a1766087c7264655.pdf?index=trueIn PDF document text
    • http://sagawojuros.rf.gd/4003904079.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_0c55d44c870b4a04a7ded4b43be22674.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_1e022cc430cd4c8db313244cc9895e1c.pdf?index=trueIn 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_off0000c12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 5276 bytes
SHA-256: 5bafd62d6c89f0a83721c29e407df08e69645480b49b839f02b2bb92c81a1679
font_01_sfnt_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 10088 bytes
SHA-256: a4aed531a0af0ddee9ad89a25a2b1cf26155ce3333629b92f01c72eeaeed97d2

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