Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b71689bc571e81…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 02:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c4e0f6e1526ea4e01fdc5e46d545355 SHA-1: 1f4db66d2dbe1959778814899276d2cf937e2d8e SHA-256: 17b71689bc571e817095cbc39f4e78ddb702de448c500453178cd5e45749d229
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. One embedded URL, 'https://vilenefex.ru/123?utm_term=minna+no+nihongo+vol.+1+2nd+ver.+w%252F+cd', is directly present, and the document body, though heavily obfuscated, contains references to 'Minna no nihongo vol. 1 2nd ver. w/ cd', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=minna+no+nihongo+vol.+1+2nd+ver.+w%252F+cd PDF link annotation
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/993d79f0435.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/wusivodaluwe.pdfIn PDF document text
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/4361999.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/639708.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/9054a7ac30fbf82.pdfIn PDF document text
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/zipofi.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/768512077051.pdfIn PDF document text
    • http://bitsracing.net/basic_concepts_of_economics_class_9_questions_and_answerscty4u.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/lang_complex_analysis_solutions.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/zejemesajozuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazatuv/divinity_original_sin_2_starting_classes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/streaming_services_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/la_boite_a_merveille_chapitre_5.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/vawawikiso.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/58394376159.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/luguxegakerobekenovoru.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/tresors_du_temps_niveau_avance.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/37391388724.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 5432 bytes
SHA-256: f65480ea7eadbb7d8c877c7f63e2dbc4f8a240d23fef850669eb88ed966f7e4e
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 12020 bytes
SHA-256: 2d7e2b448d0d26b6a32a399dc5a0387d0fd6b625268718c4b93b62150b40f822

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