Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0d663c808bae89…

MALICIOUS

PDF

84.7 KB Created: 2021-03-11 12:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b148a4ebcbb27684ee7b9f60c5bf3df3 SHA-1: 20e5ed66d9d86cff82e84e3f808fb57f5b2c139d SHA-256: 5d0d663c808bae89f878fc5b1c1bdb113f25b895ad5dfba0ebafa19b4c337e67
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/award?keyword=recirculating+aquaculture+3rd+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/rasetiwulipu/jcWjiqE/ludo_app_with_voice_chat_in_ios.pdfIn PDF document text
    • http://zebiripu.mygamesonline.org/wanuxube.pdfIn PDF document text
    • http://japadalifu.22web.org/zuxonobupodutebebepos.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/gijYibh/kokonu.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/dv0jaig/cnc_programming_tutorial_guide_fanuc_video_application.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/what_do_i_need_for_my_real_id_in_south_carolina.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/dibbijj/post_it_flags_amazon.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/89146525577.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/iiIgehb/zatozamodupixuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/ciijhhj/70667622744.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/kememonaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c1067e-40d9-4396-8eaf-76d41b4e913c/playboy_online_slot_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/choose_the_statement_below_which_is_true_regarding_adjusting_journal_entries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedda7de-d2c1-4909-8869-e49c54e95f5d/76780450342.pdfIn PDF document text
    • http://jozolefifove.epizy.com/vigiwofenozutobuj.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/sentencing_guidelines_council_bladed_article.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/47128310067.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/kubusunadafagofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b9b791-a562-4ecf-813d-341957ff851f/zofili.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/report_mensualit_pret_immobilier_cic.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/6447749709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0059d8-e469-48ce-bad0-9ec543a0a205/barbara_minto_pyramid_principle_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 5532 bytes
SHA-256: cb1f84a5ceecd68821a00ea9840855ccba1f68390529728a7e423c895b8e8ec3
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 11056 bytes
SHA-256: 4a357be7e27be42b668016077e345b687a7c5aaa43900cc1966e773dcd5dac4d
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16076 bytes
SHA-256: 2e8947c527022c2777c705293212bdbe99a5eaa236b45d3d417db44d5e5616b8