Malicious PDF — malware analysis report

Static analysis result for SHA-256 389c15ffa28590f6…

MALICIOUS

PDF

68.0 KB Created: 2021-03-17 08:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7e576d81f679adbcbc3cdd0350db2ba6 SHA-1: a6c5ba104626077f74c3016ffd833e877428890e SHA-256: 389c15ffa28590f6594f68b3e24080dd1d25e236409601f537f3556d97eb4431
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=present+continuous+tense+worksheet+grade+7+pdf' is likely part of this lure, aiming to trick users into visiting a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=present+continuous+tense+worksheet+grade+7+pdf PDF link annotation
    • https://cdn.sqhk.co/ganidabizi/jhe6Bgg/70300399324.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/motulexi_gamoto_bukirizawenojed_neloxomuf.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/bejimuxug.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/hfjcgiU/fimuvalokifijijowago.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/hhjja6X/youtube_video_downloader_chrome_mobile.pdfIn PDF document text
    • https://titapogesasoja.weebly.com/uploads/1/3/1/3/131380181/f48c19.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/bifomidiruwubolegik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talavapupaniv.rf.gd/does_jump_rope_build_abs.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/dragon_city_rare_dragon_combinations_breeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/68325499262.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/gajugunimubadolure.pdfIn PDF document text
    • http://luxopemuvoxu.rf.gd/bissell_little_green_proheat_carpet_cleaning_machine_2513g_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/37721533109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2aae0e-db0a-4a3e-8cd5-dbf02e53d2aa/defozovekuzulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67b52e7-ed5e-4c50-b597-e0efcde537a3/beats_studio_1_vs_2_vs_3.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_off0000cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 5624 bytes
SHA-256: c293c9be3496487b6669036d548ff6ddba9b9e9fadc4f1199b1c069864bbc9ae
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10040 bytes
SHA-256: f0304433d50939b46a8d41ea86600f378c369356b458d74eb720f1f5800f3cda

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