Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89de28f240786dd…

MALICIOUS

PDF

81.2 KB Created: 2021-03-28 18:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 97152507d06233a3bb211fc3321b2c6f SHA-1: 9bac810fde5c9535a7ec24d777743d767baba6da SHA-256: c89de28f240786ddcbff2d6ea0fb9564e44aa106a1a1a1b9ae0f2f67db30fa14
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://vilenefex.ru/award?keyword=node+js+print+html+to+pdf PDF link annotation
    • http://meriline.store/how_to_fix_a_swingline_stapler_878xxomtdi.pdfIn PDF document text
    • http://yourcy.com/patanjali_ayurved_book_freecrged.pdfIn PDF document text
    • http://buyfastedcircle.xyz/9622908037771b2u.pdfIn PDF document text
    • http://podarokinsta.site/what_does_it_mean_if_your_smoke_alarm_is_flashing_redxtrnz.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/como_calcular_mi_pago_de_seguridad_social4r1jj.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/f2jggjx/zombie_harvest_mod_apk_1._1_9.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/ggcicDx/xakofedokekaj.pdfIn PDF document text
    • http://stakingyfi.com/how_to_start_a_small_farm_business_in_australiath9rj.pdfIn PDF document text
    • http://icily.xyz/factor_of_safety_according_to_maximum_shear_stress_theory25aaw.pdfIn PDF document text
    • http://bilkaita.space/tasonabogizisiplky3.pdfIn PDF document text
    • http://todayit.pro/26552182804uf7iv.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/N0gehel/the_travels_of_marco_polo_download.pdfIn PDF document text
    • https://cdn.sqhk.co/senepaderu/ghjjahc/the_triple_crown.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/SNieCkh/fimabatadaxobukiropavilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/benefits_of_studying_abroad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fe7e8e-c2ba-4518-aab1-a2c607e7afe3/what_would_be_the_best_synonym_for_complicated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9336234b-f313-4a03-8be2-b388a91534b2/converting_ipynb_to_py.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2287c7-2f05-4d07-9d4e-45c5e6d7d9b7/which_statements_accurately_explain_why_the_renaissance_began_in_the_italian_city-states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec61379f-396f-4b26-ae85-643cf160eeb5/university_of_maryland_electrical_engineering_phd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ffa744-2a22-438e-8d4f-830b6ee16ec3/sizikimawidefa.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/service_marketing_project.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 5116 bytes
SHA-256: 3201aa93f6831cb8ff68e36e09050609723d83e51b56e00a18fb8a7e6a9a83fe
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 11140 bytes
SHA-256: 1c3a50fcfb01bbffda448db5404bc3b06191134dcad8a6e923e8c4759ca8e619
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf