Malicious PDF — malware analysis report

Static analysis result for SHA-256 f106aa57685fba57…

MALICIOUS

PDF

59.8 KB Created: 2020-12-01 07:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 02406e2b739d803ecbcdc2546a8ddc29 SHA-1: 2f8c3fc37c68afc3a502d7200b70f543ff523a6e SHA-256: f106aa57685fba57be9e8fee15247cb57355faf274544e44fd97d163ff351023
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The primary URL, 'https://traffset.ru/strik?utm_term=direct+variation+worksheet+answer+key', is likely used to direct users to this network of malicious documents. ClamAV and ML classifiers strongly indicate malicious content, specifically phishing or trojan behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://traffset.ru/strik?utm_term=direct+variation+worksheet+answer+key PDF link annotation
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://kafowudozajem.weebly.com/uploads/1/3/4/6/134613952/63237cf.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/jodolugur.pdfIn PDF document text
    • https://kutubugovu.weebly.com/uploads/1/3/4/5/134581815/d8abd.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/2ab33d84-4dd3-42d6-b621-a426cc4be0e5/wedipeluwizofefalemus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8f01b9-734d-43e8-9e8b-18d63e10d601/nutesupefuzadowowifawedoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a00d743-0d35-4ea0-8ec3-f357635bf3f0/nixediw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c65b69-d2d0-4aca-ad6f-f2d01e9ea21b/seworefuvusonoparesote.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf8755147b14804f88b47/1606285432906/earth_science_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0873a11f6a4198483d0f6/t/5fc576ee2dd96f5918a753c7/1606776559329/libro_la_guia_del_ligue_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2ad115-aacf-4f27-9679-a1fa532d548d/dasivurimemifis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b36308-89a9-4816-b217-067ee9ea5aa2/7730179616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31077316-7ef3-4e1f-9074-fff8374d7139/gelok.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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 5172 bytes
SHA-256: ff6da088f19f495323edcd5e34d37a7170832cd6ec51cf26e723f5aecb4d3a98
font_01_sfnt_off0000c260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC260 9448 bytes
SHA-256: 9fb3f1ee52464e013a1b1ac071172d54df91b10923a3dac207f726a5dc0a5d71

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