Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b61a6ea946c2367…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 08:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd92e4edf79e7a000f99fe74b87ba769 SHA-1: c77cfff9602c47c7f8a50488e3daa8c18ffdf8d3 SHA-256: 8b61a6ea946c2367c71bbf680c206a9c837fe50056e374caabc7abfa9ae5b8d2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a malicious phishing or malware lure due to its image-only nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a common phishing tactic where a screenshot is used to hide an action trigger. The numerous embedded URLs, many pointing to disposable domains, further support this assessment. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 72 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://fourfoods.com/images/files/31677380441.pdf In PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/kipixizom.pdfIn PDF document text
    • http://wsm.hk/images/files/rapixaniwozub.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/79407408983.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/pifegigifopinege.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/95014323263.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/ruzinup.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/17043028091.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/88602697332.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/51866189903.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/keben.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6aa315c9e75018a0d6fe8474d7ea094e/gurifuvimorukikosi.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/30017550798.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/17327750884.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/71750590370.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/42748138238.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/kagisawenolimabekubeba.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/11775445761520afa8e28e.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109092248596869.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1e41056d9b582f56df49e39890bbd7ea/85286943544.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/vizojazuruvirirusatobo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/77002906523.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090323210784.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/35337046238.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jufudarabula.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/sesuzuzapupolopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dr+prakash+baba+amte+movie+watch+online+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 11128 bytes
SHA-256: fde1e96cbb498249d8794c94fb795af9bdb82160d0e1da21bbab330b5eca2906
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 2032 bytes
SHA-256: 09cd6691fbbb1627d0dfc7da6220768119224cc7e55eca7214a61afd6cffd665
font_02_sfnt_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 13916 bytes
SHA-256: 172940857bbd2cea79eaccc01a70a4cf5d656fe6d7911baebb374e723180efb3
font_03_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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