Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8450b146fd1b6…

MALICIOUS

PDF

86.8 KB Created: 2021-01-26 05:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b43c42158f062220bbeaa0b372d71442 SHA-1: eefab453ee09da447397314c27a934fbe4ca498f SHA-256: 9cd8450b146fd1b6c43ae43a058927807a6f43ee58d773b1d1b541fdeff9ce7a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=pathfinder+demon+lord+deskari'. ML classifiers and ClamAV also flagged this PDF as malicious, indicating it likely serves as a lure to download further malicious content or phish credentials. No scripts were extracted, but the presence of embedded URLs and the critical heuristic firing strongly suggest a phishing or malware distribution attempt.

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://yafferge.ru/123?utm_term=pathfinder+demon+lord+deskari In PDF document text
    • http://tufezoba.22web.org/auction_website_template_wordpress.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/e9VghF6/games_like_pubg_under_50_mb_offline.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/box_office_2019_sub_indo.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/igBjiTH/reading_between_the_lines_book_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fca4c7d952ca.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/Wjdmig5/dawamofixuzuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/modurasisuwu/jchhosu/frog_jumping_clipart_black_and_white.pdfIn PDF document text
    • http://roralopokuzej.22web.org/armageddon_brand_elementalist_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/jedOUid/uw_environmental_studies_internships.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5ffdf80114215.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/hchjjd2/48370420904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff264dcd6a66.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/2pidZyx/download_cyberfoot_soccer_manager_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/8hnNCjc/babugexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_60099da69b34f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pobuwejugu.epizy.com/yahoo_historical_stock_data_url.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/annadata_sukhibhava_naa_songs_free.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_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 5212 bytes
SHA-256: 222fca47de11fe60d94424d7a65c579aef5f6187477609ee1aead205f19417b5
font_01_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10900 bytes
SHA-256: d09ae3507c5e09fd83c7391f2af86ec197250754de384b8c95efc06b01ea1684

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