Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0e58b36735f8bb…

MALICIOUS

PDF

133.7 KB Created: 2021-04-06 19:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1d42f8569648eb671dfd528f8c632572 SHA-1: 5226b0e2cbe37ff5a8e046c3bf34895f2140f9ef SHA-256: 3f0e58b36735f8bb75030d1de2bbe32a8220e47914557f273bcadc258c67e0c1
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • 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/award?keyword=bookganga+marathi+books+pdf+free+download In PDF document text
    • http://toredakaf.22web.org/krugman_economics_for_ap_teacher_resources.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/Ujegfje/happy_street_food_truck_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_603dd3a56e877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fc91e861df97.pdfIn PDF document text
    • http://jafofuk.iblogger.org/tegeratuf.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/hojfhi5/7093373858.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/hajbPic/72049016764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_60032f839c384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_603714145fd54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_604cc44016309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ffe9f88df696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://fizufizobizud.epizy.com/86908147177.pdfIn PDF document text
    • http://latodoro.epizy.com/michigan_tuition_grant_fact_sheet.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_7e48e75b33a9417bb6654802e199badc.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_7ec212c6390e40778e3fba2318ac32fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/algorithms_in_a_nutshell_2nd.pdfIn PDF document text
    • http://puriruf.epizy.com/sample_of_undertaking_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/dudotaxijudimugil.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/43429048926.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5B 5800 bytes
SHA-256: 28a057a424e71ef8d1389a8a1429f90aa5e5800d1454187315903bac5c2e6d86
font_01_sfnt_off00017006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17006 15636 bytes
SHA-256: c02a1058be92c586f3dae0b9a74301e783f8f55b26fb413ea0188a43860cacd2
font_02_sfnt_off0001a23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A23A 11876 bytes
SHA-256: 2c303f681512edae80bbfac5878d6e1a049e40f32cab161b3fac3eb7254be258
font_03_sfnt_off0001ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA4C 16192 bytes
SHA-256: b80dcff4b26782ff2bd1ed82e01ce9053ba91b1a5afb9bea673378648d26bec5
font_04_sfnt_off0001df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF99 12776 bytes
SHA-256: 35dab6de26a09cb28149e2220f1d70643c819d8b0d59c72a2043e3b7fbf547c1

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