Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd5332410ce36f1…

MALICIOUS

PDF

104.3 KB Created: 2021-03-05 23:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3dad04d962655e8544bee5e7f96b310c SHA-1: d98151fb5feb80d80b1883b81a5e2194334fa562 SHA-256: 5bd5332410ce36f194f47681e73913e39bdf4a5eb785379c4b991a3cb3c0d678
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains keywords related to free downloads of academic materials, which is a common lure. The presence of ClamAV detection and ML classification as malicious further supports its harmful nature, likely serving as a gateway to malicious content or phishing 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://soxebez.ru/wix?keyword=longman+academic+writing+series+2+pdf+free+download PDF link annotation
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/noziludolik.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/127840d26ba0.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/5638581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5fefd2084d0f4.pdfIn PDF document text
    • https://zewujinewototi.weebly.com/uploads/1/3/4/7/134749630/8242209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fc5c05866cd0.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/gartner_magic_quadrant_siem_report.pdfIn PDF document text
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/fivojipikoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_601a3aae7fefa.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/4265362.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/pibonupuwa_xokukasuzure_wizafatekaxe_mijuvaxom.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/nosaginulefoponogona.pdfIn PDF document text
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/b6da503dd1ed.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/samipu_pimemofezufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijodere.rf.gd/navezomelux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19193d02-7c4e-4651-8190-46119ba64348/83635109419.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_a735e1f765b74b65b450c612f97b787c.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_0371141213c944df8e211361675e2a11.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_9a312aee3ccf4fa3ab8e65309f8d12f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a204e867-a11c-4543-a003-1cae47167dfc/59893244918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f166f006-9eb4-4e52-b934-1095009a4a79/thomas_merton_poems_love.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_off00014970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14970 5440 bytes
SHA-256: e9609e35e1586662194f5e188ea3e572a3884cfc4535d1d4f32532af292ebf77
font_01_sfnt_off00015c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C66 5640 bytes
SHA-256: 792cba6cd50b3b3803715ddb77d707bcb39464b841a589b8ee4f300a673730fc
font_02_sfnt_off00016f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F98 10504 bytes
SHA-256: 652af95024220a0ad33fbea81aed9467e0fa32701fcb903b92d3ccc56e3ab480