Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e85e2d45ca2232…

MALICIOUS

PDF

70.2 KB Created: 2021-03-24 16:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c98e4a67935aa9b39e73da5906f91095 SHA-1: 218f1ae4e22eb3b0d8988496673424ca1e93261c SHA-256: 08e85e2d45ca223258e559180ac5b31ea454dbce22322eb0eb3c5968bacab734
186 Risk Score

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://kuzutuzo.ru/strik?utm_term=how+to+stop+return+to+sender+usps PDF link annotation
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/248034.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/dojapixifigi.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/3jahghi/fractions_to_decimals_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/ophftjf/the_whipping_boy_book_read_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/hjNWggz/4904496577.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/ijihabW/unicorn_photo_booth_frame_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/fGhjHig/85491518113.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/dZhcjiv/kukogabelutudavomuludukot.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/jexijer/hodder_cambridge_primary_english_stage_4_answers.pdfIn PDF document text
    • http://naremijex.epizy.com/vivah_movie_free_full_movie.pdfIn PDF document text
    • http://wasaxotudulolo.epizy.com/85555437239.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/b._ed_form_2018_cg.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/4k_live_tv_channels_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/what_is_the_theme_in_annabel_lee.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_598653900762475cb99a4e2918ebb6af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/lobatiwebowas.pdfIn PDF document text
    • http://dajajubofu.rf.gd/half_blood_prince_meaning.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_f885679bbe8341f0bcf6b5f1c887fc61.pdf?index=trueIn 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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 4764 bytes
SHA-256: fbf02e3d97bd8e7dd5d426227fcc35a107d90ee85ff7cb7b4108b1d06f879e3b
font_01_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 10752 bytes
SHA-256: 6d84a6af9330a1efbc0f203c92a051c155396f7f52ee7d5cff4d8032ecd69da1

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