Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfe63c4a38ecc75…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 06:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6a8721373fa988efcb776e0b2c4abaa2 SHA-1: ece1dbf112e197a6fdcd08b98b31747d76cfb874 SHA-256: 1cfe63c4a38ecc75453511e3d5ffe28ada319e820682e6300e326aca496ce126
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate a phishing or malicious redirection attempt. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=when+does+the+next+hunger+games+book+come+out PDF link annotation
    • https://cdn.sqhk.co/ruselaguzoda/UnGhggi/the_galaxy_survivor_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_60393c5f0741d.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/icie2Ga/ropejisudop.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/ihbv1hg/idle_car_manager_guide.pdfIn PDF document text
    • http://freshmind.net/cooks_essentials_2qt_digital_stainless_steel_pressure_cookera72k6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_6050c6abec926.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/fzijKFU/brilliant_distinctions_gift_card_check_balance.pdfIn PDF document text
    • http://torchland.xyz/borisodibalu9g7ly.pdfIn PDF document text
    • http://evatopshop.xyz/plants_vs_zombies_1_paid_apkdkusy.pdfIn PDF document text
    • http://servempieza.site/tamilplay_tamil_dubbed_movies_free_downloadfteo4.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/ciNhbjh/56514482990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5fe6f8d43cc28.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/jotizifime/58639143484.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/25765396823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dcbeb3-a6e5-4179-8a15-91028435da8f/50609106571.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/adaalat_2_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6846bab5-f329-4d9c-a672-507c2f0ea580/dr_amos_wilson_blueprint_for_black_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0aec5a-491d-4057-bd49-a6c68338b37b/81373447686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bdca7b-c9c4-4972-9ae7-16ec48db7428/charter_remote_setup_without_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b53c4b-79ac-450d-8fee-a1d4df380380/unication_flex_pager_manual.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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5604 bytes
SHA-256: d8927c4237617f4846a3dc986a77cc8c6e27632b4dcfde04c77545b32489b253
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10540 bytes
SHA-256: cdaa5c4157527b1b9b38793917c56521e5186aa906a74f5e8dcaaa338587ac51

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