Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d9614d357822a4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 01:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7b24433ee123f62d7b88995921dc994 SHA-1: 597af2eec2f543155c8beab5a6de1d8b5d5ed6ef SHA-256: c7d9614d357822a400f32fa81eee38cd5edc766e031e5e4063e60397806a9fe0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=characteristics+of+public+limited+company+pdf PDF link annotation
    • https://cdn.sqhk.co/titubebojek/jiigGhg/real_life_simulation_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/icgjiic/wordpress._org_login_problems.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/cyberpunk_2020_sourcebook.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/how_to_remove_lint_filter_from_lg_washing_machine.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/food_allergens_list.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/hxgfjeV/21573451197.pdfIn PDF document text
    • http://aycotoro0.xyz/new_free_brazzers5jw4i.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/ii7IPgj/dice_drinking_games_for_2.pdfIn PDF document text
    • http://jexemukanofefoj.iblogger.org/advantages_of_reading_comprehension.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/d3mijhi/free_scary_wallpaper_for_cell_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/Um7JTHC/96606487916.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/zaloganirinenivebanarow.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/cieghtg/33947028177.pdfIn PDF document text
    • http://leree6.club/how_to_get_marriage_certificate_online_in_keralaznms6.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/12501435826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegubom.atwebpages.com/84506155691.pdfIn PDF document text
    • http://tuwidapaj.epizy.com/ranateledevinatupapabav.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/tv_guide_for_world_cup_2018.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/muvikudegelotebizifotin.pdfIn PDF document text
    • http://rorujuzolu.epizy.com/platformio_esp32_example.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/21907446016.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_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 5540 bytes
SHA-256: 3be159a4b66ca190597cce34581d52aad29ec6a913c2cd755215ba551e8c122a
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10532 bytes
SHA-256: 12f4a0d245686c19657ca9eff4fbd98ca8b2362e8c80c87af22a772fc888ab0e

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