Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9328d7617cbd4ab…

MALICIOUS

PDF

83.1 KB Created: 2021-03-12 16:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e6d4d80d90015b355ffb0d63a9782f4 SHA-1: cadf41ed8eda2195e66e104a650047f2acd4d37b SHA-256: b9328d7617cbd4abf8dfd8d71f77e414764393479492f2018aedefa1b306742a
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to lead users to malicious content. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to lure users to external, potentially malicious, sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/123?utm_term=popliteal+nerve+block+us+guided In PDF document text
    • https://cdn.sqhk.co/degavorofala/gj6haYj/adventure_time_water_park_prank_dailymotion.pdfIn PDF document text
    • http://smeshnoykir.space/starting_your_own_cleaning_business_how_much_to_chargesrhqe.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/GcTFhd4/xuvaxafu.pdfIn PDF document text
    • https://gasaromub.weebly.com/uploads/1/3/0/7/130776100/3403833.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/iaXwOSL/tap_knife_game.pdfIn PDF document text
    • http://byseles.xyz/free_solitaire_download_for_windows_1090yau.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/mfB4ggf/anime_ninja_eye_quiz_mod_apk.pdfIn PDF document text
    • http://samozanyat.info/fudelijofogenobejobc4wf.pdfIn PDF document text
    • https://nuburobu.weebly.com/uploads/1/3/4/6/134633580/3540829.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/tageg_wigopiv.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/jjaVXgc/vugofusexa.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/SigAihe/maroon_colour_meaning_in_urdu.pdfIn PDF document text
    • http://leyloften.online/hile_program_indir_telefonan4pz1.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/borakimitaten.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/jizige-wuwedadi-ruzipikog.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/juiduQD/gunship_sequel_ww2_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/ihSwhj6/spectacles_day_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/hfWQqge/jumavozatuwasenunada.pdfIn PDF document text
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/d8d69a8d0b.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/9dd4cd7f17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a1031f32-da06-4da7-8c5f-431a4fdb2d22/36422154744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d0f64a-765c-4ddc-94ec-b94d4eff89aa/84875403382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2eef307-d796-430e-b77a-cefc83d3482c/internet_service_providers_in_bhel_hyderabad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec090b3-ce26-491b-8ac8-7c0cad983e32/occupational_health_and_safety_regulations_for_construction_sites.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 5388 bytes
SHA-256: 59d9049a396a8d0dd456cc8058b66c1a259a05a64f37b7daacf27eff494bf902
font_01_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10704 bytes
SHA-256: 2d891021f8e90e0adea0df1c36b70ffbcab72b589e144d1ead7e9ba30aa5124b
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361