Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac40f8c5d39b01d2…

MALICIOUS

PDF

76.1 KB Created: 2021-04-08 04:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4fc621fac491b14a7fae661571f98619 SHA-1: 82450a744b2578914edcb148488a77062baf906b SHA-256: ac40f8c5d39b01d292013dc2ba539ab775d2ce894e5cee1b0fc4845e6453733d
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-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://leonvi.ru/123?utm_term=bubble+witch+3+saga+game+free PDF link annotation
    • http://creditpm.com/jixofalisinikixazirasesedp7dcc.pdfIn PDF document text
    • https://cdn.sqhk.co/kavesake/gh0C0ge/jadikibekozesujaposel.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/rT0jgC7/disneyland_paris_mappa.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/VhjhjWV/history_of_breast_cancer_on_tamoxifen_icd_10.pdfIn PDF document text
    • http://creampiepow.club/lenovo_y500_laptop_price1tiv0.pdfIn PDF document text
    • http://cparta.moscow/what_replaced_omb_circular_a-875krqz.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/lsIpBo3/swedenborg_arcana_coelestia.pdfIn PDF document text
    • http://fopasezexelori.iblogger.org/curso_de_economia_politica_jose_matias_pereira.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://lanujozawodu.sportsontheweb.net/galivubolutowunezefavan.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/jghghhF/how_to_make_an_origami_bird_beak.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/ezgiZvq/hunter_assassin_game_download_mod_apk.pdfIn PDF document text
    • http://ueuniti.website/steamworld_dig_walkthroughcxfqo.pdfIn PDF document text
    • http://ifeelgood.club/et_arcaicayn8es.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://mexicotop.xyz/the_maze_runner_3_book_ending6ftdn.pdfIn PDF document text
    • http://topplafond.xyz/146806400977oe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wolunotolebo.rf.gd/xidixulavawu.pdfIn PDF document text
    • http://zijisulejemam.rf.gd/importance_of_ornamental_horticulture.pdfIn PDF document text
    • http://tinijev.epizy.com/formal_wear_for_wedding_lunch.pdfIn PDF document text
    • http://bidajalej.onlinewebshop.net/difewamelozaforagigodej.pdfIn PDF document text
    • http://duwujupis.epizy.com/female_body_language_love_signals.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 5740 bytes
SHA-256: 06b57eb4a9690e139194ae2a72a0d39a718e8b5f8a936de22616adeee29e40b3
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10956 bytes
SHA-256: 569901574561c0bb341d9dbc7843da2da409a306ecc2f3bf702f4be3aed7f4e6

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