Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db8d810e723afcf…

MALICIOUS

PDF

77.5 KB Created: 2021-03-04 09:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7ee2b29a32b0a5e2a2a1ce6962040bef SHA-1: 10baf84d9657c30fd912c763460df76a817efabd SHA-256: 1db8d810e723afcf01d6aa3b8d2c92542569a5c9a5a3959ee9f236f0cce76ca1
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 hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=what+does+3+short+beeps+on+a+smoke+detector+mean PDF link annotation
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/3959940.pdfIn PDF document text
    • https://notojusuwetu.weebly.com/uploads/1/3/1/8/131871856/xarineb.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/what_age_is_charlie_and_the_chocolate_factory_book_for.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/nikon_f5_manuale_italiano.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/9400103.pdfIn PDF document text
    • http://fesifula.22web.org/29396984128.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/lapepiki.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/kaxap.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/9e77998d.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/58677627832.pdfIn PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/kasegidinux-fagufo.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/junipiredojalenoredu.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/9961503.pdfIn PDF document text
    • https://vugilove.weebly.com/uploads/1/3/4/2/134234765/9104940.pdfIn PDF document text
    • https://wixevilit.weebly.com/uploads/1/3/4/8/134873569/ritapupuliteni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wogosozado.rf.gd/25032988677.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/parent_partnership_and_quality_early_years_services_practitioners_perspectives.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/bhairava_geetha_kannada_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/aroma_espresso_bar_menu.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/how_to_use_gillette_fusion_proglide_5.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/android_sdk_manager_exe_location.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_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 5660 bytes
SHA-256: 59f51f824735771bd66b02ddefc928fb0f1512445dec15259517cd11609ab772
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10572 bytes
SHA-256: 5c5cb294a961c5899d95a8baaf461c5a2b50ec23e73da48d82f0963a872ca846

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