Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d5e10accf09e8c…

MALICIOUS

PDF

87.3 KB Created: 2021-04-05 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0052336a7471c0c651b7e805651fc8a5 SHA-1: e7e4eb229f92585b49962c8c468356020a6d69c3 SHA-256: 65d5e10accf09e8c977709c3f3b3a276265f0d784405c155314e757205fd3e9d
134 Risk Score

Malware Insights

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

The PDF contains multiple external links and a heuristic firing for a 'download button' lure, indicating an attempt to trick the user into downloading content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to malicious sites or downloads.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=lesson+plan+template+for+sunday+school+teachers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460048/normal_6055bef86d7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_602a0d6023054.pdfIn PDF document text
    • http://zegumuwuvibeb.iblogger.org/ks2_english_lesson_plan_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_605f656743507.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/hghfaP6/27766030541.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/ihfMGhf/90300664423.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/nozajumolapew.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jdicjg0/fidoterugegoxo.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/358bdc28-7367-4149-92f2-fb8410e5ca10/7143825781.pdfIn PDF document text
    • http://fumonabuda.rf.gd/muzujiturerupo.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/master_excel_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01ac916-5008-4f5f-a43a-d6157e16216d/stumbling_on_happiness_summary.pdfIn PDF document text
    • http://xekujigifur.epizy.com/31376928522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1497da4-a1c7-4ebd-a206-cead5efebb15/proform_performance_400i_treadmill_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bfcefb-f65f-4fc6-b1f9-addb12f4575a/luluzawexeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd14762c-fc41-4824-a0c4-ab5d77d18a66/tibeleluro.pdfIn PDF document text
    • http://ximagutetala.epizy.com/asthma_bts_guidelines.pdfIn PDF document text
    • http://gasunerumep.rf.gd/communication_skills_games_for_students.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 5436 bytes
SHA-256: e9d0ba6f4106a8604e96c72e4ac97368b804f9f22420d90e0cf5682c6d21a277
font_01_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 11076 bytes
SHA-256: 595ebecfc9a5dba540d383269c136fe9b6762f369d82066c8dace733750df2e6

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