Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fc130aef2e6ad3…

MALICIOUS

PDF

75.1 KB Created: 2021-03-21 10:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b38125a5b5965461825193e87ce629c1 SHA-1: bd7c2d830ec313de0231416c540c88317392dc7c SHA-256: 51fc130aef2e6ad300c5445271f249cc37e1875a8a70112eff63c67e936e7d78
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URLs, such as https://mezovuduw.ru/123?utm_term=avengers+endgame+apkpure, suggest a phishing or malware distribution lure, likely exploiting user interest in popular media. The presence of multiple links to disposable hosting and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/123?utm_term=avengers+endgame+apkpure PDF link annotation
    • http://vebifitapex.mypressonline.com/20750295446.pdfIn PDF document text
    • http://siankaanmexico.com/physical_science_concepts_in_action_textbooky8k92.pdfIn PDF document text
    • http://ukranews.icu/fosox7yi0j.pdfIn PDF document text
    • http://goldalbum.ru/windows_server_2012_r2_iso_download_microsoftrdg16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5fc939b48fd33.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/luwutorotegapil.pdfIn PDF document text
    • http://rat-red.space/magnetic_knife_block_holderufe72.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/capacity_building_training_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_600c52bdce25c.pdfIn PDF document text
    • http://presentinsta.site/darbyshire_pricing_and_trading_interest_rate_derivatives8whuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_604b01f0c6aa9.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/dapojuxigorizugafog.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/troy_bilt_bronco_42_inch_riding_mower_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_5fffbde5bdea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobebol.onlinewebshop.net/rilerusuwojaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1d4a08-7f56-44c0-befb-67e66a0a3225/weber_grill_restaurant_happy_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c95cf9a-82d0-4592-8be9-480f2e54b409/what_is_the_main_point_or_moral_of_the_wife_of_baths_tale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac0b795-10c0-41dc-958b-a6b0d790a71a/80s_breakdance_songs_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e12fe1-b84c-4b8b-a72c-421591bcbab6/nintendo_64_n64_emulator_apk.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/93005748099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bd0d81-4550-40b7-8418-e51dc0f25556/what_does_subscribing_with_twitch_prime_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b59a5f4-8b32-408b-9185-f76f50c35260/how_to_read_percentile_ranks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2caeaa4-e848-46f3-9ad9-31a982dd36e9/kulonawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a32edf6-1f09-4e09-85b1-f287789040f5/machine_learning_engineer_jobs_melbourne.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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 5360 bytes
SHA-256: a80591b03dab81c3a2213d9b28c3c70e6aeb39dbfcf3767730026ecc89af84d8
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 10808 bytes
SHA-256: 3d52b9f31a08163305be043a025b524671ba0638951ea4313cff67acd4bb1725