Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b37d0e8d6487ddf…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 04:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8588b1270c9bc0156ab051991d2ab2a3 SHA-1: ee9494acf470a862783b7349273c07554e9fde55 SHA-256: 3b37d0e8d6487ddfe76467574c546a6e6e77a510da06b2ae25887926516a64c9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded URLs. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=when+you+walk+away+quotes
    • https://cdn.sqhk.co/bikugipozamu/qihFzkM/ara_pacis_historia_del_arte.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://yandex-dostav.ru/78947958864p6ivj.pdf
    • http://xtw2.club/sedotefovwnpd0.pdf
    • https://cdn.sqhk.co/gabamulijawe/ig3yhb0/neighbors_credit_union_routing_number_st_louis_mo.pdf
    • http://microbladingeyebrowsdallastx.com/rainbow_loom_instructions_with_pencilsq5ijz.pdf
    • http://tb-films.ru/cervical_traction_exerciseso8clb.pdf
    • http://theharaka.online/how_to_figure_out_mixing_ratiosl8pw1.pdf
    • http://instapriz365.online/are_prisons_obsolete_reading_guiden3su3.pdf
    • https://cdn.sqhk.co/rijujonakuje/hchiDnA/color_hockey_game.pdf
    • http://nextauto02.ru/debetowejelifitemutesalefug9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_87613d51503b47a1abc6ba0c55e9731d.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_e6c85f68af8e4c53908b7cfc18f3ed84.pdf?index=true
    • https://s3.amazonaws.com/xugigabitulu/fatunipiwuwewida.pdf
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_bdc76809500644b68b6950b0f2bf6ca6.pdf?index=true
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_0ba9bdc314d044389593cd729103c040.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/72174164722.pdf
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_fb492c682185440e96af3ad823c007c1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed94.bin
501817255e2bdca1cfce9c67ed8fd5ae8a89e43f8bf0db49a419c383f162ced0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 5076 bytes
font_01_sfnt_off0000fef8.bin
55783b5a0b3cb1c946bdf5c49a25adc58eac19184d029176b995b69302122e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 11044 bytes

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