Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3cda8a580a6437…

MALICIOUS

PDF

75.4 KB Created: 2021-02-08 01:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79269212e68519ce856f5a499ba864c6 SHA-1: bddb652cbf2af095a111b9425cc4966103d0df99 SHA-256: 9b3cda8a580a64374494aa8b5456b9d88066c25df9031bda1603c3e2cbf77ba6
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of exploitation for client execution, likely leading to a second-stage download.

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
  • 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/wb?keyword=bulawayo%20polytechnic%202019%20intake-%20pdf In PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/e3802f3faff6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454438/normal_5ffa6ad11428e.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/yuumi_guide_mobafire.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/wemozu.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/bujoze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fed60c54b1e2.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/matozezu.pdfIn PDF document text
    • http://wersita.fun/39810394272dqwtk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fee41906cf59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fe7eda94042c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_60020bfed9bbe.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/gilabusokiv_gemozegateneb_bejad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoviketi.epizy.com/96230258843.pdfIn PDF document text
    • http://wetafemef.epizy.com/bpss_forms_of_id.pdfIn PDF document text
    • http://xosufatobula.rf.gd/gomimedona.pdfIn PDF document text
    • http://pezukovurarugor.rf.gd/reading_comprehension_worksheets_for_class_10.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/wurusidugozojo.pdfIn PDF document text
    • http://xutagefev.epizy.com/candlestick_patterns_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 5788 bytes
SHA-256: c4934141c6edf651bb4a7997b92343cf10aa75bfc2e48c66526fd6ee418ec23b
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 14936 bytes
SHA-256: cd7ab9323001424aa83c66f30ab447cf37a82c0090c69164139d008d70f22c19

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