Malicious PDF — malware analysis report

Static analysis result for SHA-256 841d54a364b9f1d8…

MALICIOUS

PDF

72.4 KB Created: 2020-11-28 11:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1ba45afa9b3945774b5f80dc2b7c2ad9 SHA-1: d7e45750d2f951296fdcd99c8a77dd300fbbcf42 SHA-256: 841d54a364b9f1d84b548c33466213ea694dea371232a58d6f022bd8584685fe
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=mihaly+csikszentmihalyi+creativity+flow+and+the+psychology+of+discovery+and+invention+pdf PDF link annotation
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/df6b3c03550a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8eae6f6af43.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/buwinofamozaxuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5f955a0a0875b.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/doxinofujuzezom_rusudofakutez_petasuredawag_mubunexigexazo.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/rujabepifar/what_were_indentured_servants_answers._com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6930757e-7710-4309-b9ab-ff162d0cad9e/83528148181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c409b7e-e095-4df5-bbab-2e445485ab0c/nijebiwajunatefupi.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/pigidiperejul.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/subject_verb_agreement_practice_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/men_s_style_guide_black_jeans.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/acca_p7_examiner_report_september_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/24438358686.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 5944 bytes
SHA-256: 2f45368274a2f823ebd3708a61cc0e088473000d4179e2ec0cbe97d07249cc96
font_01_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 13428 bytes
SHA-256: 7b248de3700cfe38e66b925598dd71ca1f3512546887c88eac781afb8cdc6868

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