Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41931076e64ccfb…

MALICIOUS

PDF

72.5 KB Created: 2021-01-23 17:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 834197d5a1d59620aac4a21a4b9e354e SHA-1: 05374a7b7fe1d0d4cdbaa00619728feb192b6cf2 SHA-256: b41931076e64ccfb58672a6632f2fd95b7d81bb5830107cd6a16b2c48cb430f5
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/aws?utm_term=simple+past+form+of+choose PDF link annotation
    • https://cdn.sqhk.co/wifukatar/cRieIhf/iowa_80_truck_show_2021.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/6543629540.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/fahrenheit_451_theme_worksheet_answers.pdfIn PDF document text
    • https://site-1172860.mozfiles.com/files/1172860/zuxuxad.pdfIn PDF document text
    • http://talinab.iblogger.org/free_template_slide_presentasi.pdfIn PDF document text
    • https://site-1178784.mozfiles.com/files/1178784/32153238418.pdfIn PDF document text
    • https://cdn.sqhk.co/jivapereb/ighjcjj/slice_and_dice_wow_classic_addon.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/QZhbjho/konafixatuwufixerat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulenanevatetid.epizy.com/unprotect_sheet_in_excel_without_password.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/time_to_answer_first_amended_complaint_california.pdfIn PDF document text
    • http://vefagukolile.epizy.com/aimbot_pubg_lite.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/ulcerative_colitis_guidelines_ecco.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/antutu_benchmark_iphone_vs_android.pdfIn PDF document text
    • http://rubijisezet.epizy.com/easl_alcoholic_liver_disease_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/best_romantic_songs_bollywood_mr_jatt.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 5356 bytes
SHA-256: a2ce7560ff869c0e038debe77d384fa8275cc1dbf4a542c87a7215166b03e57b
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10540 bytes
SHA-256: a64d885484ebad3b806c846d21aa02bc4a3d494cf8b8fbe65f74ab9c4c6dfff1

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