Malicious PDF — malware analysis report

Static analysis result for SHA-256 618bf59353ec56ef…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 19:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dfc5178b91038a9a35c9e1ddf75583cf SHA-1: 4fcfe537be0119a7955630a00a2db58bf7a562c4 SHA-256: 618bf59353ec56eff16540dfef08115a2b8894ff9d2927a6be05f2ce89bb6681
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, flagged by heuristics as malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/wix?keyword=search+inside+yourself+ebook+pdf In PDF document text
    • https://cdn.sqhk.co/kegetaxob/YENVhhu/nezituzapadilur.pdfIn PDF document text
    • http://luminar3-download.xyz/bootstrap_form_select_examplekzbl0.pdfIn PDF document text
    • http://indohealth365.online/33542425923alo83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_603bd69b1538c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5fe697b263b14.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/iWwRgjV/pivebivebigatewen.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/ji4Nkje/wusirum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_604de9a8d0757.pdfIn PDF document text
    • http://matrixbicycles.com/a_history_of_western_music_9th_edition_usedgekzj.pdfIn PDF document text
    • http://eslivdrug.space/dusazukaboramipon1n8yp.pdfIn PDF document text
    • https://cdn.sqhk.co/titusegik/Bgqidhf/anime_avatar_maker_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_e57a55ede45c4666bc023bf43d821cc5.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_775c1c1522a5421ba5f786dd466b9e91.pdf?index=trueIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_99718ae81e954ab3a499a4594416798c.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_40a6d5eaabc548e8be79841237f94b0b.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_a5d11b70988441638001d2892d0251ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/in_the_heat_of_the_night_book_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/letter_address_format_generator.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_e67e0c8058b84ee28792d49b87263f46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/43991459608.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_d6a57e775cd54f5e9618211298b404c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/celestial_navigation_work_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/89407722508.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_1aa95bca7a834451b905273481ff465f.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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 5652 bytes
SHA-256: 1c0c0232bb7f86ae39135eb7d8cf2d5fc042918af7928ee57304de409894365f
font_01_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 13084 bytes
SHA-256: 5626d6f193b775cb6aac1d4ece5c1736aa308daf3acb04e7db1ce3f844052508