Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbf6aff168a7d15…

MALICIOUS

PDF

70.8 KB Created: 2021-03-02 20:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6731122ceae20396653fefcc30c2ab09 SHA-1: ab3256911c33d42e6107775311dd71d034b6f079 SHA-256: 6fbf6aff168a7d151ec669f7bec08477b59e45b4409b918d0bca168357440a35
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a large number of PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or exploit kits.

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://leonvi.ru/123?utm_term=discount+computer+repair+portland+tx PDF link annotation
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/munerazu.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/jhgQid8/hay_day_unlimited_coins_and_diamonds_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/a02Zien/bewetunetazisadefururuvut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_60136df4b4e47.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/iLihNjb/smart_install_manager_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/gdifThi/nascar_heat_mobile_mod_apk_3._3._0.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/zEo7gdE/gagutajidebeweduwoteze.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/iyRcBqj/cheap_lawn_mower_hire_near_me_for_sales.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/hLclgi1/bravelands_book_5.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/fd7hjNz/merebitogujufene.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuvusu/ieih5ia/63504988814.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/vhh3jf4/50646654207.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/semizatokozilij-vulatoduvum-gasumowazobowe-wufinuvuguzili.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/jazamerijekufol/kojopiriparu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/bodoni_svtytwo_itc_tt_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/mi_store_india_app.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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 5284 bytes
SHA-256: 0b6ba1cea93316eb8014dfc68d69d9321b4af0ee97294762b3098cd599ebc02c
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10528 bytes
SHA-256: 636245350011d24b7e5f89f94b7b05169eb65621ec730a8cda96bbaa775eecf0

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