Malicious PDF — malware analysis report

Static analysis result for SHA-256 d063815d8a4dbc16…

MALICIOUS

PDF

94.3 KB Created: 2021-03-13 18:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 77ce60e39d9b70fe403676bc4dc39eea SHA-1: c576698fc9075da59848870c01466ee49fdc1ddf SHA-256: d063815d8a4dbc1626a83e2dc4485ad6fbce6a080ef32f9b3f345e55dd8f2c71
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/wix?keyword=a+tour+of+c%252B%252B+pdf+2nd+edition PDF link annotation
    • https://cdn.sqhk.co/lerapuraroke/hatn0ih/fire_emblem_hero_mod_apk.pdfIn PDF document text
    • http://msertis.xyz/wolf_simulator_3d_online_freel5ad5.pdfIn PDF document text
    • http://golosa-spasibo.ru/different_kung_fu_fighting_stylesrcpzs.pdfIn PDF document text
    • http://websecurer.tech/engagement_invitation_template_online_freeczzhm.pdfIn PDF document text
    • http://alsamcctv.com/how_to_determine_the_reliability_of_a_research_instrumentdwg1c.pdfIn PDF document text
    • https://nibovipuduri.weebly.com/uploads/1/3/0/8/130814681/7881037.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/fofadigawobox_zevoradapawo_godolasor.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/5817106.pdfIn PDF document text
    • https://xidakagufade.weebly.com/uploads/1/3/4/4/134400986/tutoru.pdfIn PDF document text
    • http://ru-order-687646765445.art/bedtime_stories_movie_netflix0e7j3.pdfIn PDF document text
    • https://cdn.sqhk.co/mapuvokunoj/HD7ihjc/28638906739.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/ciixGia/pin_diagram_of_ic_ne555.pdfIn PDF document text
    • https://perixezekawuxod.weebly.com/uploads/1/3/4/5/134504143/9368119.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/WqeWgc2/vegipowasebegogumitorida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavivexudis.epizy.com/do_air_force_get_paid_more_than_army.pdfIn PDF document text
    • http://migusopugaj.epizy.com/android_mobile_developer_skills.pdfIn PDF document text
    • http://lesupaj.epizy.com/gamemaker_studio_2_download_mac.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_b5e4c0613c23427694a92d05a310cadd.pdf?index=trueIn PDF document text
    • http://vegosazozadexe.epizy.com/lily_collins_book_unfiltered.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_3a526a7c648943ccb4ac8f65b64ef026.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_a124351e72664b02bbb17fb1b66f1618.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
    • 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_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 4852 bytes
SHA-256: cae92f97aed8f5028fd2f45805d3040d54eb7a906febe1bb98da43be99d1d861
font_01_sfnt_off00012db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB5 12080 bytes
SHA-256: d935bc7df040c189ea364c4430f3cac94c83472d431f63ba0fc4d9c36a6440c7
font_02_sfnt_off0001568e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568E 16112 bytes
SHA-256: 04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292