Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e2a5d4f97fe431…

MALICIOUS

PDF

80.1 KB Created: 2021-06-01 17:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ddd18297cc1f769e9274248e995006d1 SHA-1: ee13109823ddbe563c7c3b794dc5b538cdf7980e SHA-256: 83e2a5d4f97fe43103fba9fd61d1059385c5fa9657b458b49db4fefd9b8dab4e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://kuzutuzo.ru/123?utm_term=amana+dryer+ned4600yq1+manual'. This URL, combined with the 'SE_INVOICE_LURE' heuristic, suggests a phishing or scam attempt. The PDF structure also indicates it's part of a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuzutuzo.ru/123?utm_term=amana+dryer+ned4600yq1+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375908/normal_600af2cb87b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_605c31f288bf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5fc9449075ad5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_6003ed00cf6f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_602d396779a88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144436608/phonics_spelling_grade_5_unit_4_week_3_answer_key.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/malena_2000_full_movie_download_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b9bc4e-a03d-4d8b-a1a7-b21c7b910378/girl_scout_song_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560a28b9-e0aa-4cfe-8c9a-bbc9a6fb4e77/xiwalojupaluwiwokusamutir.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144421671/shadow_fight_2_special_edition_hack_mod_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c312f2e-d1e3-4b66-a8cd-e49bc3378bbf/fowewokozilawuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fa2aa3-ff0b-430f-a46a-656ac966d1e5/how_to_test_oven_temperature_sensor_with_multimeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef6b3c4-d10d-4f9e-b15e-05d63797582a/dugotef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4694e7ab-6998-4f4f-bbcf-4944ca3cb6b4/xopalul.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/f/dental_assisting_training_books.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/is_there_any_xbox_360_emulator_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4b8626-6355-4117-ae77-e31ad4ebd9a1/tugozilelom.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144447363/how_to_open_bajaj_allianz_premium_receipt_password.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 5088 bytes
SHA-256: ab727270e1dd7dd3e425c7a5efc45845c4e18d47791b622833cd778b49cb9d72
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 10924 bytes
SHA-256: 92e1477c83e50d6de2293747d23fb4c946a8efcf5992d546a441282183d15f82
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e