Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77d43fcd2e89dfe…

MALICIOUS

PDF

79.1 KB Created: 2021-05-09 18:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25760f8f81e74486b660ff16dc7f91ad SHA-1: 24a3ff1cd35866b8b2040bd6c0a676a4eea724a4 SHA-256: c77d43fcd2e89dfee8ba45a2a9e44318589cfa033857177e4ec067b06fe4f40a
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and a specific URL related to software activation, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=acid+pro+7.0+activation+authentication+code PDF link annotation
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/pavodotegemadafek.pdfIn PDF document text
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/570288.pdfIn PDF document text
    • http://dsv-trening.ru/fijolopagonavixozavuligtham.pdfIn PDF document text
    • http://atlas-copco.su/fizuzavofajetevowksyia.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/3f2e9153204.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/10a9e4d02.pdfIn PDF document text
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/1782663305b6d.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/misulewo.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/adc8398db8de.pdfIn PDF document text
    • http://successinyourlif.website/22845569263dr2xc.pdfIn PDF document text
    • http://itrom.fun/21212545814fn0zr.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/d8852e39f83f5.pdfIn PDF document text
    • http://seamanygau.best/lusapeludabifazijepu6hmo1.pdfIn PDF document text
    • http://bbcua.site/temple_run_game_install_in_computersaolv.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/wefuduxib.pdfIn PDF document text
    • http://rebelliona.online/what_is_the_road_less_traveled_book_aboutzz8v7.pdfIn PDF document text
    • http://genoray.pro/7755231318j54a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_bd31057facfa43fd98440014ee2865dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/belfast_building_control_application_form.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_77bf8528e25e4efea1f5b73bb9ef88d9.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_8b6a45f80ed24149aa2714a82fdeed78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/mi_voice_recorder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/kiguzin.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_abb6bfb5ec694abd9aa3ff1b80e3fdf8.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_ac2b77b2469e4acd86dc00605f84beaa.pdf?index=trueIn 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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 5256 bytes
SHA-256: c9adee3b6201f8d386a53cbcdabd47a747fe8c9c8f915dbfbe4c465f1529b4c7
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 11720 bytes
SHA-256: b78286390a921ee3770434a98a5d57e8cb1f8651adfaf307bc309ca7299fd4ee