Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2199daad5608de…

MALICIOUS

PDF

77.6 KB Created: 2021-01-26 19:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 65fe9c820316e64e5f6f346d54ba494a SHA-1: a82aaa8b6abeb592e42617ccd7a0c789a9cd4f92 SHA-256: 4f2199daad5608dea78264671989cdd0eef5b77fc8af643f14d155d9cf4c645a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a link farm or redirection scheme. The PDF's structure and embedded content, despite being obfuscated, align with techniques used to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=funny+things+you+can+ask+bixby PDF link annotation
    • http://idealica-official-it.website/great_farmers_in_the_world3k5ca.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/icwjfij/esrs_policy_manager_linux.pdfIn PDF document text
    • http://varnisvakq.ru/mini_games_new_arcade_apkj5raq.pdfIn PDF document text
    • http://alisaborodaenko.design/football_manager_2015_download_maca4n8o.pdfIn PDF document text
    • http://bu-markett.com/f1_2016_season_standings52934.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/Aic2BPE/amazon_assistant_manager_jobs_near_me.pdfIn PDF document text
    • http://indir-kazan.com/xexebofapuxanlv2ml.pdfIn PDF document text
    • http://xbet1.fun/rilijaledufnxk52.pdfIn PDF document text
    • https://cdn.sqhk.co/kokijunuxagi/hfLhinx/logezon.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/diiibGF/zisomese.pdfIn PDF document text
    • http://haifaiv.ru/color_balls_falling37eg0.pdfIn PDF document text
    • http://nosinoski.shop/pipojirolotonomumome6939b.pdfIn PDF document text
    • http://salearea.pro/mixadodrt98.pdfIn PDF document text
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/pamovaj-rimomunutug-nolazaxa-bibax.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/fUicbWK/95336685317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokilenosabani.rf.gd/fixodumadi.pdfIn PDF document text
    • https://forums.androidcentral.com/showthread.php?t=855264&s=cb263018b0efc53f8554468af05fff1aIn 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://forums.androidcentral.com/showthread.php?t=855264&s=cb263018b0efc53f8554468af05fff1aIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 5260 bytes
SHA-256: 3e99f2b571539a1b1d5d07f3979a4e9598d4fa6b502b63e41e18faa979f17d0e
font_01_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 2528 bytes
SHA-256: c6252b4d8d750144d767bf15398de2e5b59ad7453580c69ac8a4daf0d2525ed8
font_02_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10376 bytes
SHA-256: 1a24f111c7129f7b9483c57e446ec8351937851c1b06b3b97d9a1bc885839a58
font_03_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 17216 bytes
SHA-256: c38bde71c070ccd47df6aa41e017f0e4ce2e0a84430e58a13750ab6a33622970

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