Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4667b6b66e288f3…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 11:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1a2664c7401305b8485c3705083e11a1 SHA-1: a34971f9faa63ede3173d62ebd9515d7e3e0050e SHA-256: b4667b6b66e288f3a97c6301b1ea0a8a56aa3b5d779032df35accbf1e5b6aa2f
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a lure suggesting the user install a browser extension or plugin to view content, a common social-engineering tactic. It also functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, potentially for credential theft or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/wix?keyword=apk+fast+downloader+online PDF link annotation
    • http://generalmassage.online/maiden_voyage_herbie_hancock_sheet_musica1m0f.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/djj4ibA/heroes_vs_monsters_ios_11_download.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/dufov-kumapa-jebowanar-jipurakezupu.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/lugosugalodexako.pdfIn PDF document text
    • https://xivupofe.weebly.com/uploads/1/3/2/6/132681771/cdc1bc06fe604.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/Chdjhjc/vawapawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_604ce2e9359d5.pdfIn PDF document text
    • http://ca-manalapan.space/65740622176j9pqb.pdfIn PDF document text
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/7760226.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/7638183.pdfIn PDF document text
    • https://zirivuso.weebly.com/uploads/1/3/1/1/131164479/4c082e3f50.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/Mjchcgc/72396125197.pdfIn PDF document text
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/8588455.pdfIn PDF document text
    • http://buybritishcat.com/application_for_schengen_visa_italyynmey.pdfIn PDF document text
    • http://khanapoorti.com/what_is_the_message_of_all_the_bright_placesmgowo.pdfIn PDF document text
    • http://chisto-chisto52.ru/sesojikuibqb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fe8d4df8d447.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/fepewitaz.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/dd710c5c6ff65c.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/vedexajawo/31338198574.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/brochure_design_templates_cdr_file_free.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/30538656351.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/jowepo.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_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 5180 bytes
SHA-256: ef26c25188b1c5f3a20a47b029883ed0c115ea44e2e6f64ba686808dcf9b5571
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10800 bytes
SHA-256: bbac2bf4859736e1e55734444b3402e8231c97c85f349f0cb9d14d70ff21c332