Malicious PDF — malware analysis report

Static analysis result for SHA-256 d282fb4a4a3cd249…

MALICIOUS

PDF

70.8 KB Created: 2021-02-13 11:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 293f1fec5ffca377ebd1493c1422c41b SHA-1: 50ad137ca08c26fd299ff5f00d86d31d77283cce SHA-256: d282fb4a4a3cd2498bc652b656dcf672635ff5c05daa254f03a5dca168301a5d
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 0.9991

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/123?utm_term=download+apk+inoty+os+12 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fedd4896b7c2.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/hjCWjji/kesamusazawenuwazuta.pdfIn PDF document text
    • http://sidegut.22web.org/malicious_software_book.pdfIn PDF document text
    • http://probnik1313.tech/89822333911uq882.pdfIn PDF document text
    • http://teachersaid.fun/the_joker_hd_images_download7ea8j.pdfIn PDF document text
    • http://blu-ital.space/the_intelligent_investor_reviewpsri9.pdfIn PDF document text
    • http://mnogoturov.com/turbo_collage_app_freeqsqhs.pdfIn PDF document text
    • http://originalhallyu.com/planet_pizza_summer_street_stamford_ctorfm8.pdfIn PDF document text
    • http://ins.expert/acordes_para_bajo_electrico_de_5_cuerdas404a4.pdfIn PDF document text
    • http://dilijox.22web.org/tubawumugomurotamovete.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/jzhahef/lottery_scratching_tool.pdfIn PDF document text
    • http://poroda.site/customer_satisfaction_survey_template_emailm9q72.pdfIn PDF document text
    • http://gimepar.22web.org/bavajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_600ece935e9f8.pdfIn PDF document text
    • http://bestcreditcheck.info/872057213641jzlm.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/hhehfhg/57566072238.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/bgfjghi/wugowesev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopoduki.rf.gd/gizexovuritore.pdfIn PDF document text
    • http://nemunuj.rf.gd/political_chess_3d_apk.pdfIn PDF document text
    • http://pedijuwugeta.rf.gd/vupexi.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/mekilivepasuniberasidapa.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/11041123107.pdfIn PDF document text
    • http://pifexowofimef.epizy.com/steam_api64._dll_gta_v_free.pdfIn PDF document text
    • http://givemuzod.epizy.com/pupiv.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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 5300 bytes
SHA-256: 94fdc13b9cc0c2f903481847d5af7a3143c1fac0f17347559f94286525b6d13b
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10556 bytes
SHA-256: 13161e9425b5d8a742c4756ba0b83819c5f48326e56c1691c1d61244579e25c1

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