Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4a114536b1a462…

MALICIOUS

PDF

84.4 KB Created: 2021-02-23 13:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: acae076c60afc918c3343deabd210fe1 SHA-1: dd391ff1df9dc42cad2ac27169644a25e49736a9 SHA-256: 6f4a114536b1a46230850f390bc6eca7b3b1642ea5e1bbb2999a3037b7175d0b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=is+roborock+s5+worth+it In PDF document text
    • http://kushtanash.ru/all_saints_academy_plymouth_ofsted_reportqfsp2.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/eLgrqib/todegeviguke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_60122ef2c54f2.pdfIn PDF document text
    • http://sell-toclick.online/beats_by_dre_studio_wireless_battery_replacementw88cp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5feb1d9fe4e9c.pdfIn PDF document text
    • http://mosquito.codes/ncert_maths_book_class_10_in_gujarati3tmz8.pdfIn PDF document text
    • http://arendagg.xyz/15345022740vmwpj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5fc5c9b304ca6.pdfIn PDF document text
    • http://tatajosak.22web.org/sql_server_date_timestamp_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_601ed85b33387.pdfIn PDF document text
    • http://pimazisiperej.iblogger.org/33874014928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxogif.epizy.com/ctet_7_july_2019_ka_answer_key.pdfIn PDF document text
    • http://wigelasipop.rf.gd/sojewubizizojawarakaku.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/pumpkin_sheet_cake_brown_butter_frosting.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/blaupunkt_tv_manual.pdfIn PDF document text
    • http://funasuruwet.epizy.com/farm_animals_worksheets_for_kindergarten.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 5004 bytes
SHA-256: e4d7bed180a2f30cb027e2242fa1849bf01515f727842f0822a7bde3f1bfeebd
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11084 bytes
SHA-256: 97d6f6fbec2ec54e2de6b6559d66f4746821f07899f1a05f8c399842ac7ffc4a
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16124 bytes
SHA-256: aad06a1983eb0237cf280cf32c197bca0457592c1320e47def4f888981303bf4

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