Malicious PDF — malware analysis report

Static analysis result for SHA-256 3792ddece740170d…

MALICIOUS

PDF

74.7 KB Created: 2021-04-16 21:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 58a76660fac4366b841649e1520ddb19 SHA-1: 7a86df1a143d62bc7aeda591ba41204138e002b5 SHA-256: 3792ddece740170d3c8bf9836bd64faeeaa8998cf201d45ca1484f9e1db7e474
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically directing to 'baarspo.ru' under the guise of a query about grandfather clocks. The PDF's structure and the presence of external links suggest it is designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=is+my+grandfather+clock+worth+anything PDF link annotation
    • https://cdn.sqhk.co/sevijeruba/jIjcid0/53675629305.pdfIn PDF document text
    • http://halfraire.xyz/99033151072srccy.pdfIn PDF document text
    • http://mmmuuuue.space/72907535366rgayr.pdfIn PDF document text
    • http://mamajan.space/end_sheet_bookbyq27.pdfIn PDF document text
    • http://table-wait.com/business_math_formulas_grade_11iys8e.pdfIn PDF document text
    • http://russianstravel.ru/71830126014ldxw7.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/hapWCep/96701213535.pdfIn PDF document text
    • http://znakomstva69.space/pufevodovotejwu4oe.pdfIn PDF document text
    • http://repochka.site/4059938241lss6c.pdfIn PDF document text
    • http://rerubin.space/wowhead_demonology_warlock_guide2g2q2.pdfIn PDF document text
    • http://luchdobro.site/uplay_unrecoverable_error5vssq.pdfIn PDF document text
    • http://wide-do.top/portfolio_120-watt_transformer_manualzzafy.pdfIn PDF document text
    • http://harkateine.fun/493967654962tq5z.pdfIn PDF document text
    • http://legiontry.online/6238104421dpgrg.pdfIn PDF document text
    • http://kataeta.club/532349312065yobw.pdfIn PDF document text
    • http://getbuiss.online/nijijirelumominos4to1v.pdfIn PDF document text
    • http://temppicture.xyz/wilunejavavuvifodixokereq6qac.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/juliziwojatige/kusinuwusadujad.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/android_studio_screen_capture_disabled.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/zazokexidoleludoxiwuzugof.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/new_vidmate_apps_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/browning_double_auto_serial_number_location.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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 5628 bytes
SHA-256: a3eea0f388e1569dfafa75e70bf773dbfb41ad4635595405ea0294c0fbbc387d
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 11032 bytes
SHA-256: e743a667a72706b117df0f49f2c0192400e3f7deab22ce81c48d50acc4148f96

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