Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38a6ab3f099a3b0…

MALICIOUS

PDF

76.1 KB Created: 2021-06-11 18:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2fa952e98943dc73b9351826122f6435 SHA-1: d0c766e6897fb804bf329e1f65686bedf5d7e299 SHA-256: b38a6ab3f099a3b082e4fc2f41c036e5e07f89a58f81efae26fade14e0262b75
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It functions as a link farm, directing users to various external PDF files hosted on disposable domains, likely as a lure to download malicious content or exploit vulnerabilities. The presence of a 'Browser extension / update installation lure' heuristic suggests a social-engineering tactic to trick users into installing harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/pbw?utm_term=forensic+movie+english+subtitles+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421473/normal_6050da2e2273d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fe349d1972c6.pdfIn PDF document text
    • https://rilubaka.weebly.com/uploads/1/3/5/3/135303332/fipefokuzera-xokil-fevibinugiv-xogevadowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_60c16f6f91f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6064ae5e151ba.pdfIn PDF document text
    • https://lugarulanug.weebly.com/uploads/1/3/5/3/135383187/deb1227f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_606cde6640756.pdfIn PDF document text
    • https://vewominejijisos.weebly.com/uploads/1/3/6/0/136053907/446b968.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/mupakilekasuwol.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/fapina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d43160e-ac8d-4657-a674-15e1dab91603/raxitovene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e17ca9d-3e01-4524-8f8b-334a17859191/59125882113.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/23187220359.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/zugadelafosalero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefbec85-91b7-48e4-850c-f4b78add5f89/9993394633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2359220e-6bec-4a1e-bae8-b58cf0e430e4/xuxanam.pdfIn PDF document text
    • http://fupimogevif.pbworks.com/f/28322969904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5151d1-0427-42ed-a456-ce3bedb3400e/62963845739.pdfIn PDF document text
    • http://barotidi.pbworks.com/w/file/fetch/145092072/sample_of_a_teacher_cv_in_nigeria.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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5680 bytes
SHA-256: cc77235518560fa9af500c50368ae25a3af0679af089f1ec15cdd5fe7a4fea33
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10556 bytes
SHA-256: 465af0ab6f544454ca69c47a370529647f4fca2a71643bff568ea61739cb2215