Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1e7c8ea99640d4…

MALICIOUS

PDF

94.5 KB Created: 2021-02-20 13:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28ab10f9920e38d4a6e05f4c05689e55 SHA-1: 0fddb36a8711d5ba06c11775f4337001f1dd2b11 SHA-256: bf1e7c8ea99640d4a350cffa55407f954b175ee05dd4b2fb7500d950a6ac26f8
186 Risk Score

Malware Insights

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

The 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, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the potential for malicious JavaScript execution or redirection to phishing or malware hosting sites.

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://druttle.ru/wix?keyword=rca+blu+ray+home+theater+rtb10223+manual PDF link annotation
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/nokaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fe827ce83cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_601bb3f65188d.pdfIn PDF document text
    • http://onlinekartiadesi.com/dominos_near_me_menuef4fy.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/rizewidanekuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425227/normal_600107f26ef63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_6020a6587d722.pdfIn PDF document text
    • http://summ-green.fun/game_booster_mod_apk8yqh5.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/pufiwetoresipibomom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481847/normal_5fdddf27688cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fd8a16ee5aef.pdfIn PDF document text
    • http://docita.fun/controle_theoreme_de_thales_3eme6xr9d.pdfIn PDF document text
    • http://helpcenter.business/66400811975z6vdn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_6022cdbcaa806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fcdb68ce72fa.pdfIn PDF document text
    • http://bigowet.xyz/as_a_police_officer_what_is_the_importance_of_report_writingcfxug.pdfIn PDF document text
    • http://menbp.online/85065286666i6ead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_60027fc67d361.pdfIn PDF document text
    • http://natur-green.fun/lewozutaxerawezidhc2k7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 5600 bytes
SHA-256: f1092c181bc0651301221d5d7b4293485cfde43bbf7e74dfa53f864d2300be5c
font_01_sfnt_off00014807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14807 10720 bytes
SHA-256: b5eee375fd7db837fa4216b15990578f4c5c56d4f4b5927bfbb3fd20f0290568

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