Malicious PDF — malware analysis report

Static analysis result for SHA-256 c655562f45693066…

MALICIOUS

PDF

68.6 KB Created: 2021-04-06 03:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 069b5f970e0346aca2e97cd0a132f790 SHA-1: 8647728eb83e902167c7f6e49c019c338b8e3949 SHA-256: c655562f45693066c3ceec1478faefa74bff734449446628c3f6a6fea929b775
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=citizen+navihawk+at+manual PDF link annotation
    • http://fuvisetitisenon.mypressonline.com/sondaje_vesical.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/the_complete_film_production_handbook_fourth_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/ggbmcSu/56424158666.pdfIn PDF document text
    • http://peskomment.ru/12697988677ybrcd.pdfIn PDF document text
    • http://refowozawigut.22web.org/plano_metro_bruselas_2020.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/zomiruzojotesobaxuxofe.pdfIn PDF document text
    • http://kinoogf.space/xuporadekexivisonimebaseylp6l.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/26614688927.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/iAZVqbH/bruce_almighty_movie_dual_audio.pdfIn PDF document text
    • http://esmoney.site/87182933291b36nx.pdfIn PDF document text
    • http://stroiline74.ru/apex_legends_quiz_answers1csmf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://filutapokupa.epizy.com/kebulem.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/dd_beyond_monsters_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a69e225-5385-463e-9f3a-3dea08e37949/how_to_open_a_pet_store_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59944ba-75c5-451b-a287-0074fd345458/matlab_programming_book.pdfIn PDF document text
    • http://ranitirunom.myartsonline.com/97022855137.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 4712 bytes
SHA-256: 6b7224b364f872d8d8d8cbaed9144b4ca6e66fff8b7d2a7823b85fd17a132b9f
font_01_sfnt_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 9972 bytes
SHA-256: 564693f3d7c0e64bfff235649df46e6aaf76c14764c63f48ae06caaee5335131
font_02_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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