Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4327b8dabb6b764…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 21:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edc41297fe4d1654804bac46c7585f9e SHA-1: 4842c0c6d115937d87b5bc2f124f493aecb896aa SHA-256: c4327b8dabb6b764f2c1d0f2eecb30b2fbd2d1511474df9867276c8a04c4cedd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=guided+by+voices+bee+thousand+pitchfork
    • http://vumajufeboxidik.mywebcommunity.org/besotirutakifukug.pdf
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/zipowu_wutadigixawiga.pdf
    • https://cdn.sqhk.co/jivobukafon/he4jiFD/core_connections_algebra_1_answers_chapter_8.pdf
    • http://vawurabel.mygamesonline.org/54197724924.pdf
    • https://cdn.sqhk.co/bitaxukezor/ria4hfS/vaxuvosoraxesubirozukubap.pdf
    • http://rasudilikid.mywebcommunity.org/about_computer_science_engineering.pdf
    • https://cdn.sqhk.co/mofosalamo/6ijgiRw/uci_world_championships_2018_mtb.pdf
    • https://cdn.sqhk.co/kerutadit/EjaiaTU/text_twist_free_online_gamehouse.pdf
    • https://cdn.sqhk.co/kenalutaxi/5giGCha/commando_miniclip_game.pdf
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/xakenefosuvotabajom.pdf
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/6628944.pdf
    • https://cdn.sqhk.co/lexijunibul/2ifnAUr/40791539736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1dee9e8-2785-4376-b12b-fad3f2488003/bose_sounddock_remote_control_manual.pdf
    • https://uploads.strikinglycdn.com/files/bcb4e667-9d81-4b2b-9f93-1c67b786ecae/how_to_remove_call_forwarding_on_iphone.pdf
    • https://uploads.strikinglycdn.com/files/8b156ad4-17ab-4b43-ad2d-3b657527b554/borarufisikivof.pdf
    • https://uploads.strikinglycdn.com/files/df643375-dc67-4f28-ae75-cf8870013609/how_much_is_rosetta_stone_german.pdf
    • https://uploads.strikinglycdn.com/files/caa4cfd9-afc0-473d-a690-d5d073a8f9eb/sexitojavesafivenumum.pdf
    • https://uploads.strikinglycdn.com/files/b7415719-a9a9-475b-9fc7-c887667ab450/dell_latitude_e6410_core_i5_price_in_bangladesh.pdf
    • https://uploads.strikinglycdn.com/files/e60071f8-cceb-4b78-b66f-5dc387239126/resumen_del_capitulo_4_de_batallas_en_el_desierto.pdf
    • http://bidejepeko.onlinewebshop.net/taleranaxodolefi.pdf
    • https://uploads.strikinglycdn.com/files/698aa1d6-72fe-4f6b-8ae3-b26593def22e/80999448041.pdf
    • https://uploads.strikinglycdn.com/files/21369979-74fa-42de-a898-e12efd8502cb/gaguraleribabuzo.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_off0000fe4b.bin
285142a12c8e378ca6a45274cdd812d860fab1706520b0c6f66f920bf2bc10df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 5608 bytes
font_01_sfnt_off00011164.bin
e93d651c96909bc2efeac94755ed543917a4d40e47ae91c9ceaabae191274636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 11160 bytes

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