Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c93cc91a2bc883…

MALICIOUS

PDF

90.6 KB Created: 2021-03-14 14:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 01ff4f6ff04d408931a737a82b97c808 SHA-1: 09d76233d588aa718a75a1112f6a9bd269e6bb39 SHA-256: c3c93cc91a2bc883a380b892e5f30e14a8300b1d055d27c15dfd744249158655
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to 'fokemale.ru', which is flagged as a malicious link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=grieving+the+loss+of+a+child+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469349/normal_5ffd6f5da08b5.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/8gcha3R/7368885365.pdfIn PDF document text
    • http://megalit-korolev.ru/17874093505evch5.pdfIn PDF document text
    • http://domsale.xyz/how_to_align_liftmaster_garage_door_sensorsbcyd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fdc35173036e.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/17784983420vgtxq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413462/normal_5ff207e76eb0b.pdfIn PDF document text
    • http://usesalle.xyz/black_landscape_wallpaper0cmf4.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/ahbibhi/jumper_color_switch_balloons.pdfIn PDF document text
    • http://prizinsta24.space/wiley_anatomy_and_physiology_lab_manual_answersddor0.pdfIn PDF document text
    • http://myluckybet.xyz/words_describing_the_sun_as_a_source_of_energywez9x.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/he7VPjh/arbor_day_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_602cb2cc1696a.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/gjiaShc/71611431143.pdfIn PDF document text
    • http://matras-24.ru/74597360085t2lpf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_6027beb676ae6.pdfIn PDF document text
    • http://ihsteam.ru/boss_audio_bv9386nv_steering_wheel_controls03zru.pdfIn PDF document text
    • http://mugedly.xyz/kognitionstest_online_frif3ctv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_cdb27cf951a04e8d9958dd35ac54bb88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/558bbff4-cba6-4b23-bbc6-db981e5d8ceb/how_to_install_filter_in_idylis_air_purifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ba95d6-778a-4baf-b5f0-7b39c14e659c/homers_iliad_short_summary.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_3c108b0d05a84f66ae80e9b6fcafb739.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c327e768-ecf9-4f7a-8329-b97e4862ae5b/the_chronicles_of_narnia_3_full_movie_watch_online_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78066c35-e7c1-487c-82e5-400d103ec3c8/5462340364.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_93f3ab701d8f49b595b56897405e37cf.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 5508 bytes
SHA-256: 33ee1c49bd077c3fa19d31810bb47d3d00e0ed888092f7dcca6127449544c1f1
font_01_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 11220 bytes
SHA-256: 03f50d0506feb8e606d7bd9f2499af8ac182f32465f3dd895d51ac8bf12d667a