Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d6455ec474ce9e…

MALICIOUS

PDF

79.5 KB Created: 2021-02-26 05:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 163a8c912689fdac8bea3f37c9a1c7d5 SHA-1: a6428795a3b7e4ccff6af712c3a0879349636d98 SHA-256: e7d6455ec474ce9ec02bd13ab45f6cb4dad10aec247919b31ec5723f707b1bdf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. The document body, though heavily obfuscated, appears to be a lure related to 'Primerica products'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=what+products+does+primerica+sell PDF link annotation
    • https://cdn.sqhk.co/jimumakevaji/6fhhBGS/best_piano_teaching_book_for_4_year_old.pdfIn PDF document text
    • https://cdn.sqhk.co/gubusase/ughtngd/venmo_card_balance_check.pdfIn PDF document text
    • https://cdn.sqhk.co/noradinez/hbaoexZ/lathe_machine_all_tools_name.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/bututilokopelafiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5ffe697e4fbe4.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/LEhfPsK/offline_gps_tracker_app_android.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/how_to_write_an_abstract_for_a_research_paper_proposal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_60265d17a8b73.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/j2jdjcT/prince_temple_run_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/ajchjaU/megufedak.pdfIn PDF document text
    • https://cdn.sqhk.co/nonagidux/wjehfE1/server_jobs_los_angeles.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/zavaxegepogu.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/euiggdu/sesuzevijivizukoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fdfd823911e6.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/ehegcje/home_design_stay_here.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/lezudaxavopo.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/hcbBTe7/ted_baker_dresses_us.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/46326915416.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/anime_video_wallpaper_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/staples_5_large_tab_insertable_divider_template.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_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 5324 bytes
SHA-256: b5bd120bb54a73222b3f0f037cd37ed0d1073c44745d917d8a726d4a5f11fe3c
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 10892 bytes
SHA-256: d3a55e70010092d5ef532944bbab8833edfaf949c4574d57d31ef2a946c12fb7

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