Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cb71a04d0955e4…

MALICIOUS

PDF

93.4 KB Created: 2021-04-02 02:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02dff72671a616df1e7aac218868f19c SHA-1: a1c52676007fe702fe8b0dbc2d5ed9bde9ce072d SHA-256: 40cb71a04d0955e468094b5d35609af2fbe88f88cca51bda797c55697928914f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://cdn-cms.f-static.net/uploads/4373004/normal_5fd109d6bfdb6.pdf In PDF document text
    • https://cdn.sqhk.co/dodalowogiv/biciahn/turexenozoderanuben.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5fff5486a9cc9.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/atomic_habits_audible.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/pBhbiib/dobujuziraxukuvot.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/86572136140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_604858724857a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_603a475150fc9.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/anemia_karena_penyakit_kronis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fe4c995c13f4.pdfIn PDF document text
    • https://cdn.sqhk.co/febalotifako/jaifohb/top_pop_songs_2019_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxojuvef/jhcihI4/blue_doodle_jump_icon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=peter%20pan%20and%20wendy%20first%20editionPDF link annotation
    • https://s3.amazonaws.com/povelenavuviw/how_to_use_essential_oils_in_a_cool_mist_humidifier.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/bluefish_editor_for_windows_7.pdfIn PDF document text
    • http://mimosoxokilufaf.epizy.com/fefodaboban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ada1f3-73c0-4566-824f-d12deef75aca/50044651816.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/quiqup_brand_guidelines.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/digital_painting_in_photoshop_susan_ruddick_bloom.pdfIn PDF document text
    • http://vafikozokus.rf.gd/xeburezatirusivivabez.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/32850030212.pdfIn PDF document text
    • http://jezesukawug.rf.gd/minimal_animated_instagram_stories_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/97769211837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13db22f-bf6d-4b08-9db0-b5d2b832e800/whats_the_best_crochet_stitch_for_a_baby_blanket.pdfIn PDF document text
    • http://todizugofufufax.epizy.com/bee_sting_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48422ac3-08f2-4ea2-800a-66134b2bdb1c/how_to_clean_char_broil_tru_infrared_patio_bistro.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_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 5200 bytes
SHA-256: 1c1c568332f44cc92025f6f1abab4602bcc195a2ec36cf8b163c2f274f51ec8c
font_01_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 11420 bytes
SHA-256: a42ffb77188b33a6c8b8c96ca0ce0f00fc3e457db7dde8dd649a17928d35312b