Malicious PDF — malware analysis report

Static analysis result for SHA-256 233d38173dcef075…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 21:25:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a7516fa72a6c954ce3dbee107d37671d SHA-1: 5d706ccf550620199ea8dde1699e638d8307a0f8 SHA-256: 233d38173dcef075d8f6d2cc760be04f19165a609e8dee45207b95251834e695
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external links suggests a distribution or redirection mechanism, potentially leading to exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=vandana+shiva+pdf PDF link annotation
    • https://cdn.sqhk.co/gemesikexo/ibhfjfD/creative_destruction_schumpeter_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_605ae5d510512.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/n9ghsgd/listen_free_voice_chat_rooms.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/jbmjhje/nipopotenezozavuwodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464529/normal_5ff26c1864073.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/mathematical_induction_trigonometryxte0r.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/6ihJjd9/voxubelimogazodolimuvivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_601b5fad86748.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/8397778.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/jeheiez/3ds_max_2020_update_2.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/hfD30ig/baixar_survivalcraft_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_605d0be8ecb70.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/xobuzugofojikuli.pdfIn PDF document text
    • http://tronreserve.online/62812590159e1vuq.pdfIn PDF document text
    • http://milansit.space/19437635733a7v94.pdfIn PDF document text
    • http://loveworld.club/lukiparawugegonavogouq15i.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/UBhh3f5/31127986261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fe78a7a3df42.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/GjcfMjh/88780993705.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/26ujegj/directv_channels_packages.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/dIie8he/kit_dls_liverpool_para_dream_league_soccer_2019.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_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 5024 bytes
SHA-256: 0e3db4b5f8ae81e36f08903ebca2a66086d84e3f55f87ede764e88070153d070
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10404 bytes
SHA-256: d13c449f2aedc5ef6f5ff59434dbbd44bd69bb2b9b8ddd753a17a55943771493

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