Malicious PDF — malware analysis report

Static analysis result for SHA-256 8937dfc9de5b07d8…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 14:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a38b0e543e33a697e5ef927a646fcdb SHA-1: de5e06486919ed83e21a8dc20245a143092fa26d SHA-256: 8937dfc9de5b07d8d6f349a02b405f82de1a74e69a5677fe65603b63034f33d3
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain keywords related to the embedded URLs, suggesting a lure to trick users into clicking on these links. No scripts were extracted, but the primary attack vector appears to be directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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://crophysi.ru/award?keyword=ceremonies+in+zambia+pdf In PDF document text
    • http://onlinekartiadesi.com/free_bible_quiz_multiple_choice508dm.pdfIn PDF document text
    • http://spindlndou.space/speed_distance_and_time_worksheets_grade_52pnvx.pdfIn PDF document text
    • http://sodahq.pro/what_is_the_synonym_of_table_in_excel26whz.pdfIn PDF document text
    • http://shop50off.info/19787559205ku8kg.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/hbghNys/peekapoo_female_size.pdfIn PDF document text
    • http://cupe1.ru/guwepituligiwisaj1u13.pdfIn PDF document text
    • http://karnaval.host/rivejidenexilikot0va5.pdfIn PDF document text
    • http://apeech.ru/willy_the_sparrow_full_movie_englishodrmi.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/RgjVGfE/fedimekonokituzojizo.pdfIn PDF document text
    • http://obmenkalnr.online/bettercap_install_androidoqmim.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/6ih5igl/gatalaleb.pdfIn PDF document text
    • http://itagreen.fun/are_star_wars_books_any_goodwayfq.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/gijbiez/mr_zombie_2_chinese_movie_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_335757a66f3e4a2783a627c0700ef5c6.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_1afcb084942843009491fdc84d4da206.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06047ae-3148-4a18-b5a2-908f9f77bec2/custom_hats_no_minimum_order_australia.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_3ee5a9938b684c2ca971aa94326870ed.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_10d58adaff524cb18ea0876c89b0966e.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_7da29dbba7be47a0bd3293a0fdff2c9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8c95ad-1910-4ad1-948f-65fc8eb75c07/zolebolabemijejonukilof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec19014d-7ba7-47ef-942d-c6c6125df83c/cell_stephen_king_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5e1e65-4267-493e-8219-1cc78fd3ef6a/ridavugibevekajazus.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5252 bytes
SHA-256: d46feeb089ca52f57ac3bcd8f4b5322d62b0b76e48da1e623e65dfebfbbcfc24
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 10400 bytes
SHA-256: fd938c338aecd232a7aefdda3d7df290e83fe4a0eb50ff3c21f9070e74faf0d8