Malicious PDF — malware analysis report

Static analysis result for SHA-256 743b2ecb34732967…

MALICIOUS

PDF

76.2 KB Created: 2021-05-15 04:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0401e1c8382d147e7576a6fdc7240247 SHA-1: 9954cdfadb4e442ae69f96f6903cba662dbecc3e SHA-256: 743b2ecb34732967fece1f827d8b7d32da4fb6fd445c64db7c8539401539b76b
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 0.9998

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://jottigo.ru/strik?utm_term=harry+potter+castle+ride+height PDF link annotation
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/578636.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/boxuzarib_pabuxukudobor.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/vedamasami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5fd698e8cba00.pdfIn PDF document text
    • http://hh666o.site/nazuneberudorupemilib805wk.pdfIn PDF document text
    • http://naturalgood.space/24796940700eo3oj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_605f2c74cab4d.pdfIn PDF document text
    • http://reawont.online/how_to_study_for_permit_test_in_one_dayw6wt8.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/gemewu-kebijubulawizen.pdfIn PDF document text
    • http://wovidako.22web.org/the_quran_koran_is_the_holy_book_of_which_religion.pdfIn PDF document text
    • https://welarozukakiwa.weebly.com/uploads/1/3/4/4/134497755/tilutirozejemekatul.pdfIn PDF document text
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/duxajiwozozevax-nadaluwemamopi-venavapadewuri-dubug.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/VxiRjdb/cara_mekorama_level_24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_606e23a418b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_602dec70c090a.pdfIn PDF document text
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/1694676.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/ihEPMRz/dipojapoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwopugivowivo.rf.gd/amman_kovil_kizhakale_songs_tamilwire.pdfIn PDF document text
    • http://soxalisaxofaba.epizy.com/going_to_the_chapel_song.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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5400 bytes
SHA-256: 3f318f1bc1aabe1f4e98417231a8065672126003cf60b7120df086cd0baaf6c2
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 11472 bytes
SHA-256: 156b27e3dfb2634605334e9b9cba982e9546dbad6bee4bece79de12ea5d5c188

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