Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ef117d314f7884…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 05:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 445a503641a6ff1f85a2a55649071d2e SHA-1: 8987e067f8fba403a10db387ea6a4d95a57980e8 SHA-256: c5ef117d314f78848096f7434e4d05b72abc06df1aef3c416d7460e09c96ae27
134 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 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 0.9997

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://leonvi.ru/award?keyword=chordata+practical+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404740/normal_60062e3f17881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368788/normal_5fdee080af4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_604b9fabaf806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_60139626218fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_5fd3523a6d5aa.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/87209964646.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/business_card_print_template.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/kidebokazamakewedupobef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_60415c205118a.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/el_boricuazo.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/79839693394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600c8d3d77ebc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifiloxoburufi.rf.gd/nursing_management_of_neonatal_jaundice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19fccaf-c670-45d0-8947-683785a3d6c5/vitamaster_1700_treadmill_manual.pdfIn PDF document text
    • http://powagamojij.onlinewebshop.net/uniden_answering_machine_not_working_on_nbn.pdfIn PDF document text
    • http://nimunofat.epizy.com/blouse_cutting_in_tamil_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9931199-5e19-4ac2-82ac-f7e4463d51c8/41343155713.pdfIn PDF document text
    • http://kateporabub.epizy.com/anton_aubanell.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/asterix_and_obelix_comic_books.pdfIn PDF document text
    • http://wuwerodewepejij.epizy.com/makaxoxokewokojelita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af68b49b-aba4-4af1-8ad3-6089622cdf50/what_is_the_top_1_percent_income_in_canada.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5172 bytes
SHA-256: 54eb3ddeb2f5b21fd2afd2b7896ea1cdf6a1e78bd62803fb497f785b4440bdf4
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 10864 bytes
SHA-256: 22f23634aae7dbbbe9a269b3cbea83693e4d641b7552d773398a5e49699bec58

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