Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c2eadd4ce044ee…

MALICIOUS

PDF

81.2 KB Created: 2021-04-18 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0968c88115037219a151fb4cb3ed0a2 SHA-1: a911f3c882c4952afba98be2c4051ef3615599ad SHA-256: 16c2eadd4ce044eef6aed4fdf7ed2a438184774773f834d88d31a1e61aaf6a89
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious destinations. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=amazing+grace+my+chains+are+gone+piano+chords+key+of+c', which is likely used for phishing or to serve a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=amazing+grace+my+chains+are+gone+piano+chords+key+of+c PDF link annotation
    • https://norafolarujasaw.weebly.com/uploads/1/3/1/4/131453206/ziwesenovekurim.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://gabakunoza.weebly.com/uploads/1/3/4/6/134613042/kafasodidejaz.pdfIn PDF document text
    • https://dopolijakom.weebly.com/uploads/1/3/4/5/134527788/867900.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/vWjdLjg/goxexaremigilil.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/vQShcaO/magufotoko.pdfIn PDF document text
    • http://banoduber.iblogger.org/2288515254.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://uploads.strikinglycdn.com/files/131d85a8-862f-4aed-9980-d4b8306c49ed/52601377446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c603d8e-e1d4-40c3-97de-9be2608cc3c1/what_causes_lawn_mower_to_backfire_when_starting.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_1e37f3cd7cac450f8ee03351e77c5099.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_64866d819eda478e85ee0bbc05986eec.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_cce2fb24fde0477f9cf50b78b8935402.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_9f065036e5af40d7b188cb369c3e940f.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_91557e471bbc4d35a0edcd5ac2152b52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abdb787-38a8-4390-8aac-a8843b10bc16/macbeth_act_3_scene_1_quiz.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_1e06cac9c3a240bc964f234ba5689c2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb809cdd-d41f-4cea-bdae-1d08b623c098/manchester_journal_of_international_economic_law_impact_factor.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_e4589cb1ea7145938cb8e12f8b72c38c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6708e43-3312-437f-b4ba-918facf19657/nolox.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_f67cf3a265154de5a741b4398be34ca8.pdf?index=trueIn PDF document text
    • http://luvojidepezepag.epizy.com/jogag.pdfIn PDF document text
    • http://juwelaloz.epizy.com/gikafudobojolexu.pdfIn PDF document text
    • http://fenelepor.epizy.com/tokosujifumotuve.pdfIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_b5e840bbba244dc488d72a8157bee8d3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5452 bytes
SHA-256: 362566ce1be200088bde098f4e2c1ac7f737a29315ba8005540ec7db91f23dcd
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 11168 bytes
SHA-256: 9aa86d0e67b8099ee6552da2f845f1d5db832df8261c9106e2076387a27e83a1
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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