Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5eb0db161745e5…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 20:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 999cfb09595068a98c896a0adeb87b06 SHA-1: b9aaf79dbe4f927f71816199a9cf87d598c45e77 SHA-256: aa5eb0db161745e51dcb002163d03341d05a755283c6698a94532ef25a8d5b54
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=livro+de+andreas+moritz+pdf
    • http://dewigogazesad.iblogger.org/52239790838.pdf
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/xezep.pdf
    • https://cdn.sqhk.co/reriwoduriju/ehdiajb/27997858859.pdf
    • http://nuvifufaronez.22web.org/would_like_to_inform_you_all_that.pdf
    • https://visepawil.weebly.com/uploads/1/3/0/7/130776118/3611434.pdf
    • https://cdn.sqhk.co/gazegarov/ejdiajd/consolidated_theatres_kapolei_commons.pdf
    • https://cdn.sqhk.co/seseniluvus/fiaxjcV/solitaire_ring_with_diamond_wedding_band.pdf
    • https://cdn.sqhk.co/luwesefizi/gcjbgeQ/74087381959.pdf
    • http://papogemedafudak.22web.org/pax_s80_password.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_76603202bf0d4fca9ef841c75bbabe98.pdf?index=true
    • http://dakawarinuku.epizy.com/bahara_full_hd_video_song.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/rasoku.pdf
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_def53cd850b4435c9ef2fbf83e471fb6.pdf?index=true
    • http://jerefepebox.epizy.com/tp-link_tl-pa2010_instrukcja.pdf
    • http://firiwigisu.atwebpages.com/59867739317.pdf
    • https://s3.amazonaws.com/dovulavavo/superman_hd_wallpaper_for_mobile.pdf
    • http://ruvemad.myartsonline.com/mckenzie_exercises_for_herniated_disc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d376.bin
3de98a67d3ec663838a9f998ac4a71a1dc0e0b4596624bdc074f9ae8782747b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 4992 bytes
font_01_sfnt_off0000e463.bin
cab321a784da3358e7d183cce3575a6737b501218b3b574b9b7c5a3208800681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 13116 bytes
font_02_sfnt_off00010c36.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 4324 bytes

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