Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cf3e8bd7658763…

MALICIOUS

PDF

83.8 KB Created: 2021-03-06 07:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 53e3eb07a6112488acd13fc3222b6d70 SHA-1: 9ec4ed2236181bbeb4394d815829252aae42e74f SHA-256: 90cf3e8bd76587631fdaab3392ba169c32ed7086b9577151c95a4ff1e48c0b05
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body's title, 'Como hackear twd road to survival', is a lure to attract users to these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=como+hackear+twd+road+to+survival PDF link annotation
    • http://koolmaxt.online/91374353082qijve.pdfIn PDF document text
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/rimotejizutopa.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/cjb3Xha/kung_fu_cat_x.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/igixij4/28374389108.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/fEhjahh/21450135538.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/hgUiihb/puwarukuzopuku.pdfIn PDF document text
    • http://anarchymedya.com/woxatojesezojilo3kkiz.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/iguijgc/12225329754.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/ijjghhb/metal_nut_and_bolt_storage_bins.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/PqibJli/slice_dice_chop.pdfIn PDF document text
    • http://merovew.xyz/kevujusobiwogikezegy5ti.pdfIn PDF document text
    • http://probkin34.xyz/how_do_you_service_a_husqvarna_sewing_machinevdxu2.pdfIn PDF document text
    • http://remontnatali.ru/ginitewib71cid.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/FLithbT/zebomafibotixi.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/nogutebumon.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/shghZhj/10762094198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babijegogaluz.epizy.com/vizizafotuzitakazubo.pdfIn PDF document text
    • http://zeralibogol.epizy.com/gewexejagugerufumu.pdfIn PDF document text
    • http://linakagiwabofa.epizy.com/6965956113.pdfIn PDF document text
    • http://borarizi.epizy.com/nenivujevenefudidema.pdfIn PDF document text
    • http://fozinudar.rf.gd/closet_dimensions_guide_in_cm.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 5300 bytes
SHA-256: 24dcd7cb5a0c1f1fd48bbf51ca5372852075f1994d8e893f7e2655ea43a33c94
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 10260 bytes
SHA-256: e8a06cb91c6451bdb99c80ebc58a283dfc4cc607ab0d8d9107022d3337bf8d6b
font_03_sfnt_off00012b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0F 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1