Malicious PDF — malware analysis report

Static analysis result for SHA-256 a920b3ff590ff28a…

MALICIOUS

PDF

72.6 KB Created: 2021-02-22 21:38:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 019073c28c37b4ab196d6f514b6e981f SHA-1: c8d04c0c18978eacd3481785b54c90c1d3cae8ab SHA-256: a920b3ff590ff28a4abc3afd171da07f37290e710bb541442b37c386c889bc73
154 Risk Score

Malware Insights

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

The file is a PDF containing embedded URLs, one of which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to direct the user to malicious infrastructure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/wb?keyword=touch%20of%20class%20clearance%20bedspreads In PDF document text
    • http://adyga.site/principe_mecanico_epubqt9eg.pdfIn PDF document text
    • http://leftoutclub.com/news_report_on_indonesia_earthquake98lld.pdfIn PDF document text
    • http://marafonsport.site/battle_royale_in_early_accesskfpi9.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/Zha0Ejg/color_questions_for_students_during_distance_learning.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/cthhijd/free_online_games_for_girls_hot_dog_bush.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ffd6429b03c9.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/68hdJUR/pufuguzovi.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/fhiGnji/dungeon_pixel_hero_mod_apk.pdfIn PDF document text
    • http://trokot-new.online/bozetojitivujazabijirupibp3.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/diwitapezu/what_channel_is_the_rap_music_on_directv.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/emathinstruction_geometry_answer_key_unit_8.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/juvumeli.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/77905184637.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/519005444.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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 5332 bytes
SHA-256: 733c2b6ce0dc355ef8e4df5a6d6c1f0001483d950a720cec639d3d47d688d9fe
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 10808 bytes
SHA-256: 87cd6ea8e00f3936284704017d1dca01ba8551e2f75025aa99f446f1fa26c5f3

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