Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dcc37abcdd516e…

MALICIOUS

PDF

97.3 KB Created: 2021-05-12 05:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe373111d96981ab55ca46d6c0052415 SHA-1: 72caed1c2e04304ebd860119cde78eb23b9f9b5c SHA-256: 75dcc37abcdd516e6e3a0bc00ad0c24e34d653cc25608218718984a2f3bcfd12
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=best+handheld+water+flosser PDF link annotation
    • http://dosaxixapaxa.medianewsonline.com/bitsat_mock_test_papers_free_download.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/abstract_on_bacterial_concrete.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/doduf-tegerasumikas-watefit-ruged.pdfIn PDF document text
    • http://tryici.xyz/nedumapopizigatasirufatum90c.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/inoculation_method.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/hbihhj8/2080564837.pdfIn PDF document text
    • http://melidagerukebel.sportsontheweb.net/dubuwoduxisurepezi.pdfIn PDF document text
    • http://store50off.info/zuvevewuk6lrs7.pdfIn PDF document text
    • https://kiruxujekan.weebly.com/uploads/1/3/2/7/132740547/wexowawarixodex_toxinirusowop.pdfIn PDF document text
    • http://coins24h.com/simojikosolegagisipakilhijc.pdfIn PDF document text
    • https://sasifebuwanozag.weebly.com/uploads/1/3/4/2/134234849/5392883.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/XR4RDhe/57173198290.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/microsoft_visual_c_2015_runtime_64_bit_download_windows_8.1.pdfIn PDF document text
    • http://weridif.medianewsonline.com/ordinal_numbers_worksheet_grade_4.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/7698904.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/rjhjcUy/graphic_design_student_portfolio_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://jepemanek.weebly.com/uploads/1/3/4/5/134589705/bd52b01a0bcc4e3.pdfIn PDF document text
    • http://xilavinem.medianewsonline.com/daxududepemeze.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/nosepevozux/1257432114.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/oracle_sql_to_char_date_formats.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/docker_rpm_centos_6.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/just_listen_chapter_1_summary.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/meade_4500_telescope_eyepieces.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_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 5136 bytes
SHA-256: 5dc299586006ede6151a097015d57c4c1685a73f4294f67c86709ccfa6f28a25
font_01_sfnt_off00014eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAE 11708 bytes
SHA-256: b28c8c241f4b7c8f04e1d6ccb8655f104984580605416926f1b7ca53afddebb0

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