Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfe5dad46b1fa41…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 20:58:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 089cd891a69edcb71d9ff168dc2c23dd SHA-1: 02641d6842d7b963afd5985577da25be84a1f8a2 SHA-256: 1bfe5dad46b1fa41ab71c8a226fe587419180e9b48a95cc21a945a3b373a93a6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be redirecting users to a link farm, likely for SEO manipulation or to serve additional malicious content.

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://seumenha.ru/wix?keyword=alla+prima+painting+pdf PDF link annotation
    • http://bufo.online/pumokugowh6kf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_60305ee357ed2.pdfIn PDF document text
    • https://gowobokibisalo.weebly.com/uploads/1/3/0/9/130969305/7616671.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/perila-zifixab-wobaxufavan-semuref.pdfIn PDF document text
    • http://jirafka.space/6435649712xiptl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481841/normal_600a8b9fa2794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_603b89fad8d42.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/tp_link_tl-wr841n_v10_firmware_download.pdfIn PDF document text
    • http://magicwoolshop.com/big_7_division_anchor_chartcm9yz.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/wulaxa.pdfIn PDF document text
    • http://electrumwallet.buzz/85811365095z0y74.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/xeber.pdfIn PDF document text
    • http://world-wildshop.com/77463010494n9mmz.pdfIn PDF document text
    • http://mx50off.pro/estadistica_descriptiva_e_inferencial_aplicaciones_en_psicologia9i1mt.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/laxubez.pdfIn PDF document text
    • http://cparta.moscow/lapejakuxadusobg8q2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_6018c101664f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_6415325ac0bb4aef9f416fc96cc60cf4.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_bc880c7f55a04b4ebd17e7a259cf3bf0.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_8849ab4d7d174358acede1597632d680.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_9fab7d403798406db03ed8e4b13139bd.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_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5172 bytes
SHA-256: 82104317c3d16b964b11a1607df1710c7bbf0f0df443626598b9b391bcdd9a61
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 10148 bytes
SHA-256: dd7c7ce8aed23431ab912dde3f7b83fb3f298a4824112432a603dcb2534876dc