Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ca598b40a3dc53…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 19:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2922336b397d604cc6e604deba14d6e SHA-1: a2a15a8e6976faffc3177ec83917f11ab841b65e SHA-256: 85ca598b40a3dc531b5bfc22eb30c05ae022a3d578dcc2e66e061720f90904e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and multiple external URIs, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_IMAGE_LURE' indicates the document is designed as a full-page screenshot with a clickable button, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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 68 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.
  • 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://irlanc.ru/uplcv?utm_term=zack+snyder%27s+justice+league+online PDF link annotation
    • http://myphamhelios.vn/luutru/files/lepozafugimajirogiz.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/bejep.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/16035652363.pdfIn PDF document text
    • http://mama.plovdivweek.com/js/ckfinder/userfiles/files/tavinisikeditigu.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dasifonivimelamokegaso.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/42085861579.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/47786838631.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/labif.pdfIn PDF document text
    • http://abc-tel.ru/data/File/fowagadunoduxabi.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/67555162223.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/82379188461.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/lejafagogelabisix.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/16020386102.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/filor.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/76926194518.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/82049347522.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210904043319.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fuvomataxar.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/21563837607.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/35908450363.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mizenemafeputanoxagib.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/fozasivuf.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/43496018224.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161377d260cf7a---wogojexekuwixe.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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 14356 bytes
SHA-256: 537a4f7daa2d43680d6f68f71d22062e4f647e950044077e79a6e1f0b6780ff6
font_02_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 10980 bytes
SHA-256: 05958b857ef7af4d88aaee756b17f967812c3fca86a417377a39fdd0b8e5ffae