Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52edad7b806eeba…

MALICIOUS

PDF

72.1 KB Created: 2021-01-28 12:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7374f51119eca1744e487ac83f62663e SHA-1: b80df234ecb205b76b80de180e4fc260a6981001 SHA-256: f52edad7b806eeba8dc3a7d113f061e4c5ae4da3136f442c67e70c72e755849f
222 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high-confidence ML classification. The document body, though heavily obfuscated, suggests a lure related to 'square roots worksheet pdf 7th grade' and contains numerous embedded URLs, indicating an attempt to redirect users to external content. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=square+roots+worksheet+pdf+7th+grade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fd111dbaf2c1.pdfIn PDF document text
    • https://cdn.sqhk.co/sexifirume/ej6jbM3/83778940712.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/E0ieePA/mp3_cutter_and_ringtone_maker_app_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/c9hfii2/gunaliliwuxalowavaseraxog.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/9403190.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/rjijezU/mini_battle_royale_warzone_removed.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/hSuxrk9/66247528976.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/fjh5mjf/jorusimixisodufedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_600a6b4f3aad1.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/hjoIqbi/video_editor_like_windows_movie_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/4wOgj5A/82576141809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ffc11e9c284c.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/gVCYgj2/amazon_echo_dot_setup_without_app.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/hfidhja/vulodotixoreguladusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebejobibaveb.epizy.com/74080402707.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/gavipufurasigusududiwew.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/76880829132.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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 5736 bytes
SHA-256: ee8a4d066391d51a3e3d1d236a0761d65c21c78b04b8fc3fb4bbfc483da671c2
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 10452 bytes
SHA-256: 1d655642182ccea95298feaa20742224f6ed7363ea9f449e16e2ca180d89bc43

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