Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a6ffb943afce31…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 15:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f5fc5d5bca8e102932204c1233183fa1 SHA-1: 1a4ca636c204a7299fed08468258a534206d841c SHA-256: 62a6ffb943afce31f7a5c0129a0f5575577ccfa37d74f9755314dd6aa517db37
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, including one pointing to 'https://kuzutuzo.ru/strik?utm_term=behringer+inuke+nu6000+price', suggesting an attempt to redirect users to potentially malicious content. The presence of many PDF links, as indicated by the PDF_SEO_LINK_FARM heuristic, further supports this attack pattern.

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://kuzutuzo.ru/strik?utm_term=behringer+inuke+nu6000+price PDF link annotation
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/rebejubewam.pdfIn PDF document text
    • https://zukugobewumebol.weebly.com/uploads/1/3/4/0/134017275/1df124.pdfIn PDF document text
    • https://lonoripub.weebly.com/uploads/1/3/5/3/135319728/1108362.pdfIn PDF document text
    • https://cdn.sqhk.co/ropulufira/gdh0qvY/anger_of_stick_5_level_1000.pdfIn PDF document text
    • http://wozufilugud.iblogger.org/37194301212.pdfIn PDF document text
    • http://bobositufunoto.iblogger.org/emergency_assembly_point.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/52398f4858feb1.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/ajcgeoO/44188579643.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/fdb00506e4053.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/zolafox.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/766b687.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/Tp3id0H/7952755416.pdfIn PDF document text
    • http://korilemule.iblogger.org/cards_against_humanity_friends_edition.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/setikizo/gimajotibareguv.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/listview_adapter_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/72011316027.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/7059456367.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/jawozuvanikafijolezi.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/41242653397.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/devil_take_the_hindmost_love_never_dies.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/21044839463.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/fetal_pig_dissection_digestive_system_answers.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_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 5184 bytes
SHA-256: c02b5fcc8680be27273a878dfdd51ba17116c8b52dc99987d8c3a83354b3a58a
font_01_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 11216 bytes
SHA-256: b0e1e69bbda08d2f69cd458eb4171b7a660893779632d2e283c50e8472eeb341

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