Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66939aa060e96b1…

MALICIOUS

PDF

78.7 KB Created: 2021-06-06 01:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62dd720e610ca5ce43719f5b06e9e793 SHA-1: daf96304c00f859e4e1aaa5dd7404bfc5a7c39dc SHA-256: b66939aa060e96b1cb10af224851fa6746a98b1d58818ba9eaf07ee90e07b76e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially harmful 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://ketchas.ru/pbw?utm_term=organic+compounds+containing+nitrogen+ncert+pdf PDF link annotation
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/bokomag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_6009565155e35.pdfIn PDF document text
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/foralolejijixa_sititaxafas_zisari_jelonovudoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5fe6b76eafbf9.pdfIn PDF document text
    • https://totelegetofop.weebly.com/uploads/1/3/4/6/134662327/rokikamavina_pilowetetuparox_nujejo.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/fesulixazozut_xisobezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601fc9e00aac4.pdfIn PDF document text
    • https://bokavijuporuxeb.weebly.com/uploads/1/3/3/9/133997451/davoluwetopu.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/potir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_600e759b6f4f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5ff0da4b772d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6063680b5c89a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144676542/zigatarebuxigoge.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144620223/lopupevigamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413f4021-e7cb-4942-9929-9097bd5ccf42/cloud_9_2014_movie_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45923d47-0d07-4486-8770-066ba54b9f1e/dixie_chopper_lawn_mower_parts_ebay.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/61008059720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0204ead-01a1-4c88-a91b-14707a04b8c8/why_doesnt_my_heater_turn_on.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_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 5468 bytes
SHA-256: 54cc015ec49cd81dd3a047e39c6bd3b21cd1da514e9b1fe255291d895a73a5dc
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 11316 bytes
SHA-256: 84dcd493abaa3aa6eda9fb12a4b8c4609dbcf821f460dd7c2a69c5eb8ace9e23

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