Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a848b9f025c9221…

MALICIOUS

PDF

74.3 KB Created: 2021-02-13 00:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 58196168133067994179e846e3c7b606 SHA-1: 80a5adf314c8d1ef65cf7ea985a8ca0aeb0e46e7 SHA-256: 9a848b9f025c922174e463752847a7cb97d21e535f9d4a76bfc88d30443df9fd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://crophysi.ru/123?utm_term=juegos+de+matematicas+para+secundaria+gratis+en+espa%25C3%25B1ol`. This indicates the document's primary purpose is to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=juegos+de+matematicas+para+secundaria+gratis+en+espa%25C3%25B1ol In PDF document text
    • https://cdn.sqhk.co/xenojepezere/ibBw5GM/bee_art_and_craft_activities.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/l3ie5jh/100_best_heavy_metal_songs_of_all_time.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/ihZhjgh/kavosepununagagosa.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/aicnRjd/65721836599.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/pqhh43Z/music_racer_pc_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/Ojgjcjb/fevixugimezat.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/ibKlibr/31336253295.pdfIn PDF document text
    • http://kino-vezde.ru/bts_idol_intro_performancewnzvk.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/jahcpih/sevitiwitavona.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/gfYgfge/85365861976.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/tapexiw/55107884025.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/dsssb_je_answer_key_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/cisco_2140_firepower_datasheet.pdfIn PDF document text
    • http://firotiz.epizy.com/bombay_movie_full_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/dopepigoluxalulujup.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/zoxefoxukejakimuziwim.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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 5596 bytes
SHA-256: b1e7b1bd342c48a83487bfd8fc61b46a3ec1614e95c85375e6e6302d08429681
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 12344 bytes
SHA-256: 378262b1f8bd9395935ff324bb7b5f45393288276896f64f2c5364c90388a6b6

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