Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58cda6ba08a87c7…

MALICIOUS

PDF

83.7 KB Created: 2021-04-05 03:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64bbd1f3cc53cfcec5f7cf88b25764e5 SHA-1: ec2aa71b669eb4ca974d8f7fa96934a6466736a1 SHA-256: b58cda6ba08a87c746baf1b8021a117b812c3b0cc06465a97073e700c78dabbd
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document contains a mass of external links, including 'http://whalesqpa.fun/kevibausskw.pdf', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=telugu+comedy+movies+youtube
    • http://whalesqpa.fun/kevibausskw.pdf
    • http://paxebijevoz.iblogger.org/atresia_esofagica_y_fistula_traqueoesofagica.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://iglivesupportteam.com/beowulf_translation_tolkienx1znm.pdf
    • http://logvoz.ru/how_do_i_adjust_the_time_on_my_casio_watch12azn.pdf
    • https://cdn.sqhk.co/zegapoxasut/KjiPii4/metimotiwod.pdf
    • https://cdn.sqhk.co/jeporikate/jgF2Bjf/24698443461.pdf
    • http://vogeposekuxav.66ghz.com/bikhre_moti_movie_songs.pdf
    • http://gagarinski.su/71350412551rcsh2.pdf
    • https://cdn.sqhk.co/gixezovof/ngdgf0q/54833095150.pdf
    • http://alkostore.xyz/76920908582gfqoz.pdf
    • https://cdn.sqhk.co/moxasapiwer/1hgWW1E/cover_hunter_3v3_team_battle_mod_apk_download.pdf
    • http://rostov-mobile-doctor.ru/video_games_to_get_for_christmas_20204jlax.pdf
    • https://cdn.sqhk.co/wusoxopejezo/aihhdif/whatsapp_de_colores_actualizado_apk.pdf
    • https://cdn.sqhk.co/gefimiwotux/eQjfic6/71411564849.pdf
    • http://uaregroup.com/what_is_the_thermal_equilibriumw9zkm.pdf
    • https://cdn.sqhk.co/kevapaboxer/jbGJNGQ/mafajupamadawama.pdf
    • https://cdn.sqhk.co/gituridewo/jdYoifN/70245230301.pdf
    • https://cdn.sqhk.co/poronujefino/gi6pQOe/45352159047.pdf
    • http://gradstroy.su/kali_linux_google_drive_linksu2ui.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_039984b188834b3893c358233cce9181.pdf?index=true
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_45a8dacb2f9e4852919457950d4afa6c.pdf?index=true
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_9f065bfa143c4bf79edca5d7d3306b58.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ef.bin
0dcde0a27e1587fd1474020253a259d0a177ce106d32d155a94c736cb303af37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 5204 bytes
font_01_sfnt_off000116a7.bin
7830912fa79392d79308d4958bbf520a278a310a270a911787117637efbc2b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 13040 bytes

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