Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a40b96b69f65b0…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f578b69322164504534211923bf86f4e SHA-1: 2cfda3d34657151a450657a1492b77bf2f6b27fb SHA-256: 53a40b96b69f65b0f225c17f3e79d8d5645c21106ad1411361ed195265f0d0c8
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to job payment. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+much+do+you+get+paid+for+selling+leave
    • https://cdn.sqhk.co/woguwubege/hbUidid/rush_truck_center_medium_duty_houston.pdf
    • http://natosabi.mygamesonline.org/can_you_search_a_scanned.pdf
    • http://logmeinnow.xyz/pet_paradise_georgetown_jobsvxzwx.pdf
    • http://davupopebuwiser.sportsontheweb.net/basic_c_language_book.pdf
    • http://fakoxipedobuk.22web.org/hexaware_technologies_placement_papers_2020.pdf
    • http://startbastar.online/metal_gear_2_substance_iso1thbm.pdf
    • http://felejus.iblogger.org/chest_guidelines_for_warfarin_reversal.pdf
    • http://izzzaaa.space/rututonnsxs4.pdf
    • http://rotirir.mypressonline.com/adobe_signature_free.pdf
    • http://pearhaidhr.fun/2004_ap_lang_rhetorical_analysis_essay_sample3yspk.pdf
    • http://soldatskaya6.ru/shettles_method_book_freecm8bd.pdf
    • https://cdn.sqhk.co/lojosewude/cqiegcJ/98442816700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fipabadidori.epizy.com/63452847627.pdf
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_5bf7f4f35efd441282909c9e2f949f34.pdf?index=true
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_6dcf9660fc1c420a862e542c9444a1a8.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_b58e71ffc2ca4cc8b7b839246d4cb6df.pdf?index=true
    • http://nisinukodepafix.rf.gd/broken_vessels_sheet_music_free.pdf
    • http://ribipusoj.rf.gd/what_are_the_components_of_system_design.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecb.bin
04ac57dd7a03bcf706b62ad158a920ce999baffa4a616926341b901a0173ae4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 5784 bytes
font_01_sfnt_off0001026c.bin
fa86abbcb8d5d260e6bee58847bb02329bb0c2b3ecdfa8503df87eed1731988c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 10900 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.