Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a9c719ce59658b…

MALICIOUS

PDF

66.3 KB Created: 2021-02-13 16:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4a144edc987eee3c3729f4c9614c4450 SHA-1: 8ff0d849d9c2f19086776c1c36c6aa4dbf328399 SHA-256: a4a9c719ce59658bbc252802f724f042e10ebbf019f57f08b4bbdf4da3584c7c
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=econ+545+quiz+2+answers In PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/darojilamuxekibupi.pdfIn PDF document text
    • http://evatopshop.xyz/comprehension_worksheets_for_2nd_gradex4dh6.pdfIn PDF document text
    • http://bopepon.22web.org/80136993112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_600512de1ea99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd7ded74a8d4.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/5701511.pdfIn PDF document text
    • http://pobasomitiji.22web.org/2838744321.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/9653721.pdfIn PDF document text
    • http://keepxufi.space/fiction_book_report_template_3rd_gradebsipo.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/rujuwawi.pdfIn PDF document text
    • http://card2card-perevod24.site/xajigfwtrz.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/7dfb3ff21094.pdfIn PDF document text
    • http://biomanua.website/wajunibumakomomeguxitom9fwmi.pdfIn PDF document text
    • https://jotigigej.weebly.com/uploads/1/3/0/7/130739509/26285a.pdfIn PDF document text
    • http://xviiivbgz.com/11206224428q65ns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixulubotatam.epizy.com/fesanubukupunafe.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/bollywood_songs_video_2017.pdfIn PDF document text
    • http://sitovimewimes.rf.gd/gavezuxojoluxutodovefix.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_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 5332 bytes
SHA-256: 5d92bdc83b7f2049623b29d3023114853d3aa70480d86aaca121f7cfd37df0fe
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 9920 bytes
SHA-256: 97c9c9133e72716897c3c3697e61423435fab87a646bd3faec71c364e4d3fb8d