Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25cb6a0df704ec9…

MALICIOUS

PDF

90.7 KB Created: 2021-01-26 01:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ffb0c7a0511e9c8f10ac805b23988278 SHA-1: 4d46d1d2c0746ed025522afbcd73d211a93c8cbb SHA-256: d25cb6a0df704ec9e1897b150e0e3cc9dddbd5b1bebb83e345d56e07d211065d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/123?utm_term=green+hornet+trumpet+solo+pdf PDF link annotation
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/xijodaxi_nepozi.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jaBbW6s/best_hero_s_journey_movies_on_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/Oghgjif/disney_premium_access.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/7212609.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/e8aa7ea29ec58a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/cjeVqhe/puzzly_puzzle_game_collection_apk.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/da6a1387d1.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/followers_chief_pro_apk_son_surum3iq5h.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/XnmzfyO/bodyguard_protect_the_boss_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/fEdIgcJ/digital_saksharta_abhiyan_ministry.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/jdiiwih/praadis_education_learning_app_for_students.pdfIn PDF document text
    • https://pitekolejemapux.weebly.com/uploads/1/3/1/4/131438362/fa0d440280170.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/9f3957bb.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/ef99c7.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/3493797.pdfIn PDF document text
    • https://sozejaras.weebly.com/uploads/1/3/2/6/132695734/ffa12e94d1.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/16c095f.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/nimenoxesifawu_bopivo_wejusubose.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/j0fKjd0/nba_g_league_standings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://musescore.com/static/musescore/edataIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001290e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1290E 28096 bytes
SHA-256: 0b9f9a847a6ba0b617d22e4783dd3f6f33d39a6fdc0ad29c221bcd707aa6927f
font_00_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 5104 bytes
SHA-256: 409730ce00dc6eb6fe4c0a3be2275f441a298319ebb9c48a936df523146e015c
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 11096 bytes
SHA-256: 9f6bbb2cb5fd862b8e1f9775a0100e824a6cd07ecd49a63b6c05f6557ed9d789