Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c594bebad40b637…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1997ac45e35a4b98dc946f0c35a41c4b SHA-1: f38d072ec57be6a15530818e9913600c8e92773a SHA-256: 5c594bebad40b637c4df05a919d97839fb822fb9672a6d0d59282ea15eb7e067
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ClamAV and ML classifiers. It contains embedded JavaScript which is likely used to redirect the user to external URLs, as indicated by the numerous PDF_URI and EMBEDDED_URL heuristics. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a phishing or malware distribution scheme leveraging a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=stephen+hawking+phd+thesis+pdf PDF link annotation
    • http://artstudiodesign.it/userfiles/files/53219217302.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/bafamanipuwikegevol.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/moxison.pdfIn PDF document text
    • http://edinburghpools.com/contents/files/41916221835.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/49177738124.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/dixudoluposanovutixibo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137987d98bb5---95065628789.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/30695144101.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xumeliserezel.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/figakobedemubami.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/75360213353.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210904_88C4E02125626E35.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/gajifarixakadigedu.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/28854245800.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/53982029355.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/32623031228.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sugimitorusulim.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tunewofadegupikamarizo.pdfIn PDF document text
    • http://infosierra.es/images/editor/jexif.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/piguvejukenirabimunalib.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/48227578702.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613931b171660---jitasusopawenad.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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 17656 bytes
SHA-256: 33f3afe3d6128ba0b4ac5eff836572eb2100d41747919718df9c9af76fe07b58
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10764 bytes
SHA-256: 66544123013321fc83ebc568b0b1050eaf5621596561d76200aa5bf91542f0bb

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