Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f331f598842778…

MALICIOUS

PDF

75.4 KB Created: 2021-06-01 09:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e97b3e8747b2b74da35d4cd015c9a97f SHA-1: 36104724a454693a69fa2c0eb39f34b84e688921 SHA-256: e2f331f5988427788e968ab1eee50e86c448ef9fca459d29c4e7bfc4c6413f41
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'krisoc.ru' which is associated with downloading a driver pack. The PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=download+driverpack+13+offline+google+drive
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/8996370.pdf
    • https://mewodufupojapoz.weebly.com/uploads/1/3/1/8/131857890/5669f26f6.pdf
    • https://cdn-cms.f-static.net/uploads/4471488/normal_6014deb38b83f.pdf
    • https://korijefefaviroj.weebly.com/uploads/1/3/4/5/134506453/2e2506b9.pdf
    • https://cdn-cms.f-static.net/uploads/4386080/normal_606d5fedb1b30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lakebimutep.pbworks.com/w/file/fetch/144427338/how_to_make_a_shortcut_run_as_administrator.pdf
    • http://sizolasipape.pbworks.com/w/file/fetch/144422949/stack_cup_drinking_game_rules.pdf
    • http://fotikeralo.pbworks.com/w/file/fetch/144443193/63815477668.pdf
    • http://ridelox.pbworks.com/w/file/fetch/144449604/which_page_has_the_most_followers_on_instagram.pdf
    • http://kiletejude.pbworks.com/w/file/fetch/144428787/nuzuvanusino.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/144415719/descargar_gta_sa_para_android_lite.pdf
    • http://vatojorisa.pbworks.com/w/file/fetch/144442944/como_simplificar_fracciones_negativas.pdf
    • https://uploads.strikinglycdn.com/files/8f039c6e-67f9-4265-8f08-3a9b219a673d/zarafowikakit.pdf
    • http://tusawijer.pbworks.com/f/how_to_change_2d_to_3d_in_autocad_2018.pdf
    • http://dibesusajob.pbworks.com/f/how_to_get_video_star_free_2019.pdf
    • https://uploads.strikinglycdn.com/files/90e8f4da-fe67-4b9c-ac05-fa9f212d387f/65842020515.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e784.bin
556fdd2e949df449b91f8c6a068217a4c5750a47661078847783cee4f922b0fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 5576 bytes
font_01_sfnt_off0000fabc.bin
fc7615564a63410cc9a1f157fd2b51ab3be810f8461a1640f3f2f80408236434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 11064 bytes

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