Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bd642b6532e96d…

MALICIOUS

PDF

73.4 KB Created: 2021-03-27 15:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0bea11419e7da27c1c23a0f8a7e347dd SHA-1: 7712d96a6de489a3c6dfbeee5da1b97c8eb21242 SHA-256: b4bd642b6532e96d85a97f0f1793ac3d547392b44f4df3c06b75b94cdfc4bf3d
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/award?keyword=big+blue+bus+route+3+pdf PDF link annotation
    • https://cdn.sqhk.co/zidexamuwela/hiRnd8d/note_taking_skills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5ff3c155b5403.pdfIn PDF document text
    • https://cdn.sqhk.co/puxovijodazu/chiFVyZ/brothers_day_status_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/jajiBSE/pasifujalovogale.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/i7heHJj/cartoon_fish_hook_clipart_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/u5ifjeP/42437115168.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/dXB3khf/zig_zag_2_cahier_d_activites.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/Jjajc4Y/58431073182.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/aijWiaB/kacey_musgraves_rainbow_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/ijhbb6O/motorsport_manager_mobile_3_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/dhjmSib/53226382822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_603f17dd79b89.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/gavapozalilup/harry_potter_and_the_philosophers_stone_very_short_summary.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/twisted_pair_cable.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/detective_girl_of_the_steam_city_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d924cd42-fdd3-46c9-ac27-58fe887cca0f/what_is_the_difference_between_a_beretta_m9_and_92fs.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/cambridge_checkpoint_science_textbook_1_answers.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/wobekigabobapasi.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/alarm_controls_ts-_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ce9e6b-dee6-4c4f-bb95-977e27299c36/pilopesekijek.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/sabodajiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96a2c1a-41d5-4662-9dea-da244165437a/matlab_inbuilt_functions_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f13f422-dfe7-468b-866e-194ac890bc77/wunderdog_mlb_computer_picks.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/arduino_mega_2560_pinout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/584b8276-c588-4bbb-99e2-3d79f5560501/31029305078.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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 5352 bytes
SHA-256: 9308cedd93020b8bf76790164123a32d2b7c36924aff014210bfc10ae25f241a
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10444 bytes
SHA-256: 39da42c762ec5a87349199c589eb0e9836cce2154f517da48cabca3cf03d63ab