Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be8a3d545fea58…

MALICIOUS

PDF

65.4 KB Created: 2020-12-21 02:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 482815f1fc98d402d284341657540442 SHA-1: 57a1acb855eaea60d91cf1d826ee0b1c16e89d71 SHA-256: 88be8a3d545fea58f1065f91ae3ecfda7a497be7e8b970eed781de75c931bd96
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 0.9998

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://traffine.ru/123?utm_term=dubray+middle+school+map PDF link annotation
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/ribotapavifapenifono.pdfIn PDF document text
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/xifujimadedexis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_5fa1ed9f12bba.pdfIn PDF document text
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/97b4f446ee770fa.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/nowesovosiv.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/gozilum/it_s_always_sunny_character_names.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14d4c5bcb0228a2853727/t/5fced82914319a51dc207f3a/1607391274788/doors_awakening_level_9.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd363137a75c289d58a145/t/5fdd5d01892c8943b0957d33/1608342786501/53756783672.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/new_york_state_stipulation_of_discontinuance_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/how_to_movies_on_bittorrent.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a1d145a8629dca719f1/1606371869868/xivobinifabonuxukux.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/katy_hearn_supplements_review.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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 5552 bytes
SHA-256: 0be7cd4c3a4600be6071e3a540d2c179580b2c3aa738b4dd910744c187dc2891
font_01_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 9868 bytes
SHA-256: 0e0b02879bece5a645fd37a12b0121e385023d7bf96b6ecfbdd9d742e3408193

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