Malicious PDF — malware analysis report

Static analysis result for SHA-256 331a23b9a83a4c96…

MALICIOUS

PDF

80.6 KB Created: 2021-05-26 05:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0f754b3da0bbbb97604e06f9780f6e67 SHA-1: 72b262d4752d2c34f464e18653aaa77e98145304 SHA-256: 331a23b9a83a4c965fd675ce97f901d728f14b353cff7eea6bb836c9cf46b597
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with the primary suspicious URL being golowaki.ru, disguised as a search result. The PDF structure suggests it's part of a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=que+es+un+homofonos+y+10+ejemplos PDF link annotation
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/bazama_majalawavalo_wetekori_todunimajakivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_600e3b71118aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5fdc9fc49ebba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_602ac0e94f911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_60372277688d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_600058e27279a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5fde9e11e111a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_6039c0d33528f.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/nedawigilinara-wipanepinobobi-zutinepozasetuk-vepoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_6031843cc371b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5feb5e4436c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_602768d840107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_606e29480ce4b.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/2a118b1f-2afe-4808-810a-09d716e6a8fb/warehouse_safety_meeting_topics_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf62ad8-9196-46ee-87fe-f81e51a04f39/judovot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fa9c9f-4062-4473-85e1-97a10f947005/logafobivumaxifukesifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/768f6939-8af0-45e3-822f-c031a5dd3003/43620002109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea91cf13-07a6-48f7-8f46-20f541a4d4c3/10673521264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f714e8f-8f46-496c-98b6-091507e55a2d/american_history_x_movie_quotes.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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 5268 bytes
SHA-256: e838fb446737d4568dcd303da94e12660106d6ad88570fe2e07fa5c6a356a0c9
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 13852 bytes
SHA-256: 74bb2a15cac7f9e7c618b4ef4a96e526c9b914456b74f1586f7a3d8e1b5c396c

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