Malicious PDF — malware analysis report

Static analysis result for SHA-256 8410d8f5d01b65b0…

MALICIOUS

PDF

85.5 KB Created: 2021-06-10 14:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c451d22669ad0cfc79532ae3e79a06bc SHA-1: 43371774acd3bf914d3b469c6f4cfd96f8e8d89b SHA-256: 8410d8f5d01b65b0e57d31437e9aa0f6e2608a81a83067e4d67b373298c2243b
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 0.9998

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
  • 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://smidgel.ru/pbw?utm_term=emt+training+scenarios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6058debb972a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_604ad496c233f.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/f0a8c2a6-5ea3-41e7-b222-7bbffcfe2860/vamajulotamawolajenokox.pdfIn PDF document text
    • http://degomulaxib.pbworks.com/w/file/fetch/144879825/mipumiridezatokodifad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c0e251-768e-40ad-a8a9-a8a098a835e0/sewolusivagodudaleladewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2b54f5-8433-4ed7-b7b1-b66e727ec04f/oven_baked_boneless_ham_recipe.pdfIn PDF document text
    • http://xudusuvo.pbworks.com/f/what_is_ophthalmic_shingles.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144449124/how_to_win_a_womans_heart_back_after_you_messed_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55da56bf-eb2d-48ca-bf76-e55a33a6ae80/73467564081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d648fe-4b2e-47e2-b25c-07c1ba01ecff/27276498595.pdfIn PDF document text
    • http://buvulareka.pbworks.com/f/how_to_download_songs_from_spotify_without_premium_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e12512-4759-499d-bce5-49ac733d5e7b/vocabulary_builder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ffad28-88bb-474c-8789-a30ab93db8f8/72016615497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0252035-b521-4f5a-a8d1-008b67c9c872/grohe_thermostatic_shower_valve_installation.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/w/file/fetch/144724377/alphabet_tracing_sheets.pdfIn PDF document text
    • http://sowenux.pbworks.com/w/file/fetch/144602235/89106234138.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

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_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 5044 bytes
SHA-256: ad90e13bc90aaf457f61cc151187fd69f64456913cbe9422f6c3a6753ff8f11a
font_01_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 10516 bytes
SHA-256: 0ed6ddcb49b723cc4953ef330b556764b2144402ea2c724fd62773ecc9109e01

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