Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e2834eb182d57…

MALICIOUS

PDF

77.4 KB Created: 2021-06-05 01:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5a9d0b0ec04f48b1b63fc2dd7b836b06 SHA-1: d33e430e820856a597bd398dd162adcc3592e2bb SHA-256: f66e2834eb182d57606acf5c64eb17b102ccb0969e02af97e873380d0c49c4aa
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also returned a high probability of maliciousness. The primary URL suggests a phishing attempt disguised as a search result for a book title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://garglob.ru/pbw?utm_term=data+mining+concepts+and+techniques+4th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388065/normal_600e65c057545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5ffc3695335ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_606090efa7134.pdfIn PDF document text
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/navezalajugota.pdfIn PDF document text
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/ximowatebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_600ee7a9a436e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fdcea5cc507a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_606a6899e1051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_604e0cdd46cc9.pdfIn PDF document text
    • https://xijanejomasug.weebly.com/uploads/1/3/4/5/134506458/3f05d5a3a71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416514/normal_600636926a69f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fccb2ad2e3e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_603f79975b8e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vananizi.pbworks.com/f/xegupavumi.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/doadan_form_ay_haqqinda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f0319b-fd1f-4c11-a961-1deb9b6140b6/cisco_dta_271hd_remote_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f6e977-843d-4c23-99ab-f54891a76fd0/honeywell_pro_8000_redlink_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3055cf1f-3303-4314-987d-4a87e451f306/tulesuvixikisesuked.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418647/google_drive_jurassic_world_fallen_kingdom_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385879fe-b35c-4938-9da0-f52ece850640/why_are_ipads_used_in_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c8f5ea-c3db-4f03-a0a9-90a779d9b86e/evaluation_maths_cm2_priode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369aec69-4447-4a89-806e-48cd20dd5778/suvoresoxaxapirozis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58b1b49-83a5-4ddd-a808-63a9e359e3a4/samsung_hw-h550_soundbar_wireless_subwoofer.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144605217/ark_survival_evolved_raptor_zhmen_deutsch.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5572 bytes
SHA-256: 75d74f162a130438a88815c6c8e8f33365070f80613400fcb2463f095275623f
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 11080 bytes
SHA-256: 171739a9aa90a521d345ac3b3a99d6f25ae6dbc91cd545a686467e6473af1ac5