Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ef641b7d00aea9…

MALICIOUS

PDF

68.8 KB Created: 2021-02-07 08:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21d70fab04555c7345476bc8c2a1397d SHA-1: 5614fc8378b4f313ecd8e0444a11522eeaff0aef SHA-256: 94ef641b7d00aea9700f3f9365fd582b0d9e0757ca305f1056ed451afe5ac763
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains numerous external links, many of which are to PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm or distribute malicious content. The presence of embedded URLs further supports this, indicating the PDF is designed to redirect users to potentially harmful external sites.

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://druttle.ru/123?utm_term=my+maps+google+drive PDF link annotation
    • http://lotto-investclub.com/nemogoqecem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_601a35f9422a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fdc56ca08abd.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/xalokiditik-firipulibevu.pdfIn PDF document text
    • http://amsidisi.xyz/zefosabixougcb7.pdfIn PDF document text
    • http://0fruits.space/yeast_fermentation_lab_report_introductionyirtx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5ffacc1d71de0.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/muvemasoxaji/rezunotado.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/apache_poi_3._17_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/create_a_form_in_html_using_php.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/bs_player_android_subtitles_location.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/game_center_android_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/blackberry_desktop_messenger_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/psp_gold_emulator_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/nafuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/sinhala_adara_wadan_images.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/bharat_ane_nenu_songs_tamil.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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 5448 bytes
SHA-256: 64c8b5733cbe2925c8bd78547a7f80e35cc4023513c640ad17b79ebdfc1a7f3f
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 10324 bytes
SHA-256: 642f7ba20fcbb8755a3d4eff6582aa6d73575ae7ac2274a797af165ba0b64428

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