Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655b05be2b7c3f2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-29 06:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8296718d85ad477647b26a0c05e19622 SHA-1: cd753194c2b6507187735c07795044b78bdd5047 SHA-256: 8655b05be2b7c3f2a0a82b2733cf493bb4e8e79b0b3e289898993011a76442be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for the external URI redirections observed, which are characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=upcoming+bollywood+movies+2017 PDF link annotation
    • https://tattica.byespresso.com/app/webroot/files/upload/files/85761668118.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vokokelu.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/15491018768.pdfIn PDF document text
    • https://kapefashion.com/files/files/kalalilim.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/noredotovuwawovulokofip.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/57769190332.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/17696921594.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee50824b3---juradifosovonu.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/463930862.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/lewuzikavefuzuz.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/60481638935.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/jolixudekufarokujujezod.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/55969538757.pdfIn PDF document text
    • http://sakem.org/userfiles/files/96009216785.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210902_232434.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/11849740724.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/mojexunutojojomomarud.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/miwigakewopupuwevuf.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///46334798556.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/87394303496.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/folejur.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630889818.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/wimowiwaluduwunokaketisul.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/vuketigidakaxozekojalo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEC 11256 bytes
SHA-256: 2dc7f993d45035fd3e4241261659e9ceb198038819ebdfc49e1cc28891f0ed33
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 19224 bytes
SHA-256: a3f09c571ece1d1f6f452f548d29efca537a19057faa5ac0050194be408c020b
font_02_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1