Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3d024a3c5dbf60…

MALICIOUS

PDF

93.2 KB Created: 2021-02-19 03:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae25f210feae34d40e4aed26e7923218 SHA-1: 3b58a9f4a5684a531ca59ac70e8464182e5c2f33 SHA-256: 6a3d024a3c5dbf607722e763738c78aa9db90b97467aaa7ef6d3cbe13bb197bd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=core+java+interview+questions+for+software+tester PDF link annotation
    • https://cdn.sqhk.co/konosoka/hcLhZgf/music_player_for_pc_with_equalizer_2020.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/8471017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fecf49e31a8d.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/fOhfia1/dikigitod.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/wefalusomumuwog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479718/normal_5fe304caa7d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_600df844203ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_601dcb5c441e9.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/fAwFU9w/97196110270.pdfIn PDF document text
    • https://cdn.sqhk.co/sadoburola/yP9hdih/drop_it_meme_fnaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hjgdgdi/best_vr_workout_games_oculus_quest.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/01f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5fcc5f840bcc5.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/eFnihiy/hungry_shark_game_download_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/ggUhcgj/nipavilog.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/fArEGic/3d_cartoon_video_maker_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vavale/bartender_10._1_software.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/escape_room_mystery_word_answers_level_41.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/calamity_terraria_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/25773246956.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 4988 bytes
SHA-256: e95770bb751f35099b24abf42b2b41edef87b358efacc4bc5408f55105d32c80
font_01_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 12456 bytes
SHA-256: d383bf2d694ea771a277c9cdcbc81e57e06161ab6871f4fa71ee1656039baaa8
font_02_sfnt_off0001585e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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