Malicious PDF — malware analysis report

Static analysis result for SHA-256 539dc3172f20af8f…

MALICIOUS

PDF

110.4 KB Created: 2021-04-09 01:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9e9e6c5f6570d185b8c307b6f4ba4d5a SHA-1: 8a78df405c6a82c309158a8715dcb8b9fcb6814c SHA-256: 539dc3172f20af8f972a9def41e925dce7689a9117c5382c8169fe6c82a5ab20
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://soxebez.ru/strik?utm_term=simplicity+regent+44+parts PDF link annotation
    • http://alisaborodaenko.design/repost_story_for_instagram_download05xv8.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/4f564f.pdfIn PDF document text
    • http://duplicwcnj.space/alabama_boating_license_study_guideaztmk.pdfIn PDF document text
    • http://skout.tech/wow_classic_druid_pvp_gear_guide4sdgt.pdfIn PDF document text
    • http://tranquils.space/lijigirofewegaga91p3.pdfIn PDF document text
    • http://hangookoil.ru/dark_souls_2_bosses_tier_listvewpi.pdfIn PDF document text
    • https://fipuwetula.weebly.com/uploads/1/3/3/9/133997959/6612028.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://newberginvestmentproperty.com/11993651626tmhko.pdfIn PDF document text
    • http://homebig.space/bexigiviputujesuviwozalij3gfir.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/RZkoTBW/free_livestream_software_for_mac.pdfIn PDF document text
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/kisasodulekexoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/qg9hfhi/amazon_seller_central_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7677b8ab-191d-469c-ac0b-dc3f9670d6e1/98273360074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11cfa12a-e6f5-4fe4-89e7-2666bd354781/scooby_doo_2_spooky_island_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1257459e-91ea-4b35-83cf-cbfe8a6d9ad2/binarekarorigigidotowok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f61d9ce-c3ed-4f66-9e5e-74150811f32d/55159585369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6658a710-8c2b-424f-b210-6a741bcab3ba/intermediate_classical_guitar_pieces_youtube.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_6b36e83a4a294659989021f22078125b.pdf?index=trueIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_f0a1c08b4e0d4ed8a7d46aff77580b40.pdf?index=trueIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17495 5548 bytes
SHA-256: f3dd72b4b6e2e7a9ac3cb526e4f8cb3da2d60bc066ba31dc91e6b6a9fa46d0dc
font_01_sfnt_off00018769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18769 10992 bytes
SHA-256: 55304dc984070f05c32bb44f45cc38e673780fde6a40bab40cdc38c176247e2e

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