Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4da3f21d74af97…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 18:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17946f1af10f274a9c0dac53b77d71a8 SHA-1: e8b4ecb1bb85677edc004b1a3815cde421324f1d SHA-256: bb4da3f21d74af97bbbb9ad76c8d55dffa462b16ff977c23c5644290680bba31
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The document's content, while appearing to be search results, is a lure to generate traffic to these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=how+many+miles+can+a+honda+odyssey+last PDF link annotation
    • http://surogufepisim.iblogger.org/hand_embroidery_letters_template_free.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/zenuzaza_pajop_japofuvafomif_xidoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6041a506d34c7.pdfIn PDF document text
    • http://marafonsport.site/69128709910xwlq4.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/1301702.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/e17a610c.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/modediri_josofaroson_temusudum_powesimebe.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/garidodizamotuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_6036723818d89.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/gapivurigexotumekore.pdfIn PDF document text
    • http://usesucre.pro/westby_symbolic_play_scalelsi6b.pdfIn PDF document text
    • http://tonerinkstore.com/93383728250xie86.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/laxofimak.pdfIn PDF document text
    • https://minedikatew.weebly.com/uploads/1/3/0/7/130739540/dawadidofegixe.pdfIn PDF document text
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/149b5e8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ganusigesu.rf.gd/42134324279.pdfIn PDF document text
    • http://bepibuxel.epizy.com/4478828413.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/wonder_woman_movie_in_tamil_isaimini.pdfIn PDF document text
    • http://tititogejeda.rf.gd/xubapaxagefuw.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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 5236 bytes
SHA-256: 85c0327a9220f36a96c4d81af866b6a2ca2e8339aca3cd1d0bf8eed1f78d0237
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10960 bytes
SHA-256: f214d6dbfc327e36fb8387045a5436a04bb30503484816c52acd06ec0a7cde72

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