Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a8b05304395fff…

MALICIOUS

PDF

107.4 KB Created: 2021-04-30 21:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99fa05503e732d0a8c9ca90a26808b6c SHA-1: e9646ae43d95d0178a57dd38e5522331209aaa5d SHA-256: e7a8b05304395fffc6d4566220fdf6774aff10da2df6e995ec02aa783969aaa6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xajibur.ru/strik?utm_term=poemas+cortos+en+lengua+maya+con+traduccion+en+espa%25C3%25B1ol
    • https://cdn-cms.f-static.net/uploads/4446285/normal_602abfe2d828c.pdf
    • https://cdn.sqhk.co/dogojaseziwo/XKmYdhh/apa_citation_guide_6th_edition.pdf
    • http://topvideo.design/91259273290gyu3k.pdf
    • http://best-store.club/estructuras_y_organelos_celularesvmso3.pdf
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff8f21deea32.pdf
    • http://kemytbok.xyz/55909960991ne8ob.pdf
    • https://cdn.sqhk.co/limiwebu/wjcRjei/bixuwenuxusoxebilitokujo.pdf
    • https://cdn-cms.f-static.net/uploads/4381766/normal_60433a0756fe3.pdf
    • https://cdn.sqhk.co/zikoxazobe/b4geLid/my_airtel_app_free_download_for_pc.pdf
    • https://cdn.sqhk.co/xalazuwumi/r995Ihg/kerala_news_weather_report.pdf
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5ff03cc45636e.pdf
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5fdd67e6ccddb.pdf
    • https://cdn.sqhk.co/fowipovoji/aifqgdJ/easy_voice_recorder_pro_2._7._1_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fd12f6d9bacb.pdf
    • https://cdn-cms.f-static.net/uploads/4473622/normal_606c2ff1bc10a.pdf
    • http://defi-bet.world/rejusafafepev6eyxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_7adc8ae43a694e5498d8b397870f2c7f.pdf?index=true
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_78b8ccaecefd4e029faf3c962a40b423.pdf?index=true
    • https://s3.amazonaws.com/zidenigad/kilibigevigawasukorif.pdf
    • https://s3.amazonaws.com/davubewu/how_to_argue_and_win_every_time_gerry_spence.pdf
    • https://s3.amazonaws.com/nojemi/62091356487.pdf
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_39a4d363d66c4485b0515225c46ac71e.pdf?index=true
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_6a5ca8ab9a644d13b6ed40162ba0dc33.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016040.bin
1d07f9ff235a1afbbe10c4992c9ab901e3736c374ad5cc7eb83add12589c8d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16040 5708 bytes
font_01_sfnt_off00017355.bin
2f92d3f266afdb2d039d8bbe022049c93c1ebc8cc64e591fcd17786adacfc86f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17355 12572 bytes

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