Malicious PDF — malware analysis report

Static analysis result for SHA-256 b022c4ab3d7d0938…

MALICIOUS

PDF

78.3 KB Created: 2021-04-04 11:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a06bbbff537d470709988e071036bcfd SHA-1: 0e7e28578708b9768f23ee6b108c91ab4807fe88 SHA-256: b022c4ab3d7d0938a647ef331b11f84b0242843164b39aa1f2e1bc7c31a858db
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=hp+officejet+pro+8600+ink+cartridges+walmart PDF link annotation
    • https://fuzidofan.weebly.com/uploads/1/3/2/6/132695445/1792864.pdfIn PDF document text
    • http://getchambre.xyz/28170232688586uv.pdfIn PDF document text
    • http://fufodew.22web.org/nogitotupatirigatafafu.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/vewopudodalowopikorasat.pdfIn PDF document text
    • http://reactivascotia2020.com/where_are_cabelas_pellet_grills_madeh5102.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/xusitor_rowiwapenuwigip_nemapo.pdfIn PDF document text
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/zutosag.pdfIn PDF document text
    • http://zotuxizuso.iblogger.org/32199128915.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/wosak.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/49ba46a3b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_90063fd3d5a945729cd3357a59425a2c.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_e97a0f0489734641b96a142cda181e98.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_2ffbe82278aa43af807dbfc3618f1edd.pdf?index=trueIn PDF document text
    • http://bomigezi.epizy.com/10662173051.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/financial_report_template_powerpoint.pdfIn PDF document text
    • http://buxodanukesidup.epizy.com/nijulikukidakune.pdfIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_0d6aa570e7c848c78ac458d7bd570e7a.pdf?index=trueIn PDF document text
    • http://tefaxoxerar.epizy.com/33862240043.pdfIn PDF document text
    • http://dobupefibukin.epizy.com/bellavista_ventilator_service_manual.pdfIn PDF document text
    • http://mojelol.epizy.com/viwezufanobeporavurar.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/nisob.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/28535096718.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 5948 bytes
SHA-256: 72e43459c9615f6b84950d003e3fb8fff2cb4677edd4357aca49dad7972d536c
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10724 bytes
SHA-256: 2469dffe32820b6c712266075a0b0243a490d31c3eac04d1a34161d01ee3bef7
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f