Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33f9965ae1e8bec…

MALICIOUS

PDF

87.0 KB Created: 2021-03-27 18:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 68fba2357d0d5cb0cbc539428afc363a SHA-1: 57789d613e5fd921bbc22a7dc5a935a7221ccd4f SHA-256: a33f9965ae1e8becf1b9c9d1b5b06462d0effaf95778ab80ca0b4b927fba2eab
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://fokemale.ru/award?keyword=the+ants+go+marching+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/bexexiku/ejbDLgc/gloomhaven_sawbones_class_guide.pdfIn PDF document text
    • https://mujataza.weebly.com/uploads/1/3/1/8/131871468/a2f7149.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/bjadheB/cikara_burger_shop_2.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/1388960.pdfIn PDF document text
    • https://lodetisider.weebly.com/uploads/1/3/4/7/134732723/gubuzigix.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/cA6jhgd/beat_the_boss_3_cheats_download_ios.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/7516580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b6e6f3b1-cd35-491e-9d61-03c5e1386d45/how_to_use_igora_royal_highlifts_12-0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06319b0d-14d0-4bb0-ae55-a02b4d2d01fd/62390935010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cc020b-036f-4963-adaf-c3c20c4104a1/36297517845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75da16b-dcb4-47a1-b2dd-22e04cdd4df4/news_articles_on_business_ethics_and_social_responsibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa13365-f13a-4699-84f3-7d9cc33a27d0/56683280054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965ed2ed-539c-470e-80e2-df64c380fa6e/zabego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4cb80a-94a0-42b3-92c1-119dfe6e07df/what_events_happened_during_the_renaissance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f820380f-8967-4724-9504-ed9b81952b98/tecumseh_engines_manual_lv195ea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434a0094-5c7d-43c2-8375-aab665a39c92/navobisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b708af-fedc-4a12-8fc8-915329f600ae/68673897746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db753040-eb7b-4f54-9aec-9647454aa832/what_stores_sell_polaroid_600_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9891ed-f364-4156-9924-7b63966e2bc1/new_york_map_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21165a3-a21e-470c-870a-5c281688801d/manual_de_calidad_iso_9001_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bdf3ab-7d71-46e8-8518-9787fcd5f3cd/dd_wrt_wireless_client_bridge_vs_repeater_bridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7008d98-1ef8-48b4-ac14-00969639ed9b/46463492580.pdfIn 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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 5368 bytes
SHA-256: 0cd9b5dcaa0569133c0ad287e4b849d483638f014cdf691067d0a68ae5d15a69
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 11976 bytes
SHA-256: 51406bbca72ccad3378732de25977f2ee7fc0038cd2bc0308c967b02d1455181
font_03_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361