Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b823812b7ed943…

MALICIOUS

PDF

95.3 KB Created: 2021-05-27 22:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3bd606c15b9c198f60f5ee3954179518 SHA-1: 96fab4ba4049209b620c2fe4ffb687b959c77e2e SHA-256: a2b823812b7ed943a1e06eda2525374df910f3a45573550e4e985f93684f0d7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=cinderella+and+four+knights+episode+6+eng+sub+dramacool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473645/normal_6046351044468.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/lexakorevowenid_dijuliforofe_sekamurukot_fepimo.pdfIn PDF document text
    • https://segurabo.weebly.com/uploads/1/3/5/9/135964373/ca63aadfa074d2.pdfIn PDF document text
    • https://zoxitujiwa.weebly.com/uploads/1/3/2/3/132302939/a28d3f6e7.pdfIn PDF document text
    • https://dibixudu.weebly.com/uploads/1/3/4/5/134528380/xunirojab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_60426fde7722b.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/ranemugoget_vupetumi.pdfIn PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/ab25bcbd.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/fd9b14386788975.pdfIn PDF document text
    • https://zefilezagomi.weebly.com/uploads/1/3/4/4/134474677/vuzokunepojerig.pdfIn PDF document text
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/josulobafebama.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/momisol.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/426fa01.pdfIn PDF document text
    • https://ladipepisosixas.weebly.com/uploads/1/3/4/8/134898905/gomom_kesamilume.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/wuzufabofidikir_defukiwojotuman.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490724/normal_6005ba2616775.pdfIn PDF document text
    • https://makemugajisere.weebly.com/uploads/1/3/5/3/135317455/xemizadalinemurutoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 7100 bytes
SHA-256: 39475227096d85ee7b5ba50f4398ce83794c86cb7ebee7b56b99b09f14be7fac
font_01_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 5832 bytes
SHA-256: 058c4f752ab47b061f10044829a0c9cb6d1357f9230a0b749575817e8d4c0fb4
font_02_sfnt_off000135d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 13636 bytes
SHA-256: 132c8e46c63dfa7a1d96abf6c88e88da0ebeb13be89c49a95fbd8dbe5f9eb3e9
font_03_sfnt_off000160ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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