Malicious PDF — malware analysis report

Static analysis result for SHA-256 f443357ee0189f3b…

MALICIOUS

PDF

82.9 KB Created: 2021-05-19 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3d38d197b2bc9bc9847b08932c439671 SHA-1: 90986bbc0d4baa92c56ffff9da1f4df9af9452ad SHA-256: f443357ee0189f3b252e95573e44a1463758d4b2f57088ae626e2cab72e0943e
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing an SEO link farm and redirector to a URL associated with movie downloads. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=sultan+movie+download+salman+khan+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502245/normal_600fd03f2a08f.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/bepakamiziz-baxolizetikun-jisaxuwugoronul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fd621a7dce09.pdfIn PDF document text
    • https://vimikova.weebly.com/uploads/1/3/1/4/131437612/pupizot-xadufiwasov-zuroporoxupiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_6028114050fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_603804979e4f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60135a8da3e85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6f8944-d76a-4d67-a81e-5de098486b73/52188558709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86233653-38a2-4c45-9ac6-56c6c67558af/my_cloud_ex2_ultra_firmware_downgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4572ad36-d141-454b-b713-b836e4fe85d4/47093565241.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/why_is_my_vtech_phone_saying_no_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24b6216-26ed-460d-b470-87fac78f1315/low_calorie_food_list_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de790f45-331c-4aec-8b29-2652e7176baf/craigslist_dayton_tools_for_sale_by_owner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff62e6b3-e2d1-45d1-9cdd-6deb7be62161/57042268257.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/87098470380.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/azote_formule_electronique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51194954-a416-433e-8198-bf8e8d7579d1/old_school_music_2000_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644a5491-f87c-4128-88de-c68b7f88549d/what_android_version_is_samsung_galaxy_tab_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1afb8e-001b-407d-bfe7-11c216a34a95/is_safeway_club_card_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f65592e-ca41-494d-b933-c19310574c96/70852658613.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/how_do_i_score_a_running_record.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/real_estate_company_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f1fa09-1153-4a54-9521-85db3372e7a2/juegos_para_aprender_ingles_para_nios_online_gratis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 5584 bytes
SHA-256: e1f3fadfb3c7c31392819af3bb906b583d547f5e4f3ad9320d73ba00f8708071
font_01_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 11020 bytes
SHA-256: 972aa7d316f522360d0251bf94036391e0e312b968c616f8bd77beb9ad65e38e