Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a94cd1e92a904f4…

MALICIOUS

PDF

66.7 KB Created: 2021-03-20 09:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c69ff70dfe24a95b5206f385925ad917 SHA-1: a9309fa3715c63d4d23cd547a765eddbee3c5723 SHA-256: 5a94cd1e92a904f4cc8f355775ad3d3e2842f806646a573fff2b76894da08658
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://seumenha.ru/123?utm_term=travel+agency+design+psd+free PDF link annotation
    • http://betmoy57.com/behringer_x1222usb_driver_downloadgfh37.pdfIn PDF document text
    • http://meblik.su/700702169135emu4.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/zonagewaruvi.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/9763681.pdfIn PDF document text
    • http://busibear.com/agatha_christie_novels_rankedao71i.pdfIn PDF document text
    • http://zapitawevuv.iblogger.org/44597458887.pdfIn PDF document text
    • http://doxisodezezaku.iblogger.org/nijarizokozipewifobada.pdfIn PDF document text
    • http://afracheat5.xyz/nibazixurabinaka9ypts.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/mamukawarudis_zepul_tibavapukifap.pdfIn PDF document text
    • https://xovaxavirot.weebly.com/uploads/1/3/4/8/134853903/6978164.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/1049730a-8958-4d9e-b1af-f804915575c7/73185183804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b076281b-feff-479b-8660-380bae8a1072/vubuvugozukeluwadanigosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082b4d79-2584-4f68-ac97-3054f036ac82/modo_de_produccion_asiatico_ao.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/62209512315.pdfIn PDF document text
    • http://govatojajij.epizy.com/cherry_tree_school_colchester_ofsted_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7821e167-3bb5-4b35-a055-e956d69eeebe/xarem.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/what_is_the_moral_of_the_story_three_questions_class_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7370af7-cc2d-402d-8375-61609e1f66bf/what_is_meant_by_planned_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a9d94a-a764-4c12-bc89-e50f8704e193/weight_watchers_bluetooth_diagnostic_scale_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6a1dd3-d153-4d8c-9eda-94b79d25da8b/hp_elitedesk_800_g1_tower_intel_core_i7_4790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce163e6-382f-4742-bffb-d8051798ee7b/best_self_help_books_on_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c81b1c7-02fa-4800-8b95-9f14462063dc/brother_printer_wont_connect_to_mac.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_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 5432 bytes
SHA-256: 6ee667611ad6ba35c9f0a3e78d95b7369de46b4e568d7247e54d88706155de60
font_01_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10168 bytes
SHA-256: 55751d469d6549973597a628b1923a7b88bec776359ea50a3f7e88deadeae315