Malicious PDF — malware analysis report

Static analysis result for SHA-256 1223f9b1b0513047…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 19:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 169e516ffd716cba95bec56ff8c1cb68 SHA-1: e27187ea3a4027222512aea50e3794ba9975eeec SHA-256: 1223f9b1b05130477a267a16e867b8217dd4a87843c36d8c0c65fab6c203d65e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. An embedded JavaScript stream was identified, which likely redirects the user to a phishing site, as evidenced by the numerous external URIs pointing to disposable domains. The PDF's structure and the presence of JavaScript strongly suggest it's used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://inwebjor.ru/uplcv?utm_term=free+convert+video+to+audio PDF link annotation
    • http://iphysiology.ru/upload/76545064603.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/73376179176.pdfIn PDF document text
    • http://zamgph.com/uploads/file/121325366951.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27061332945.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/puvobow.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/japaparuketederulokutize.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/91262755177.pdfIn PDF document text
    • http://lovesenergy.nl/file/delaguxoximamavu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/55c42d0972d84e8fa32116180006aeb7/73747886087.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/86541017943.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/gelosifelufewurepipovo.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/xenevok.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/80767713028.pdfIn PDF document text
    • https://ahha.az/userfiles/file/97009799206.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/65596627668.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/86379092484.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/54130563952.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/sefapuxiponowimodusiviki.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210901_103856.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawuzifixiwepagiloman.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/66869822844.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/pumusaxuzoneterufuruj.pdfIn PDF document text
    • https://j26clean.com/upload/files/81393635310.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/nekudiruvuparelepo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/b836ja9imb71nj2gnnd4p4m8e2/xulut.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/rofibafaforekukan.pdfIn PDF document text
    • http://fluorescent-training.com/file/80315330482.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_off0000c011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC011 16240 bytes
SHA-256: 504e94029b13fda19918ab643336b27af26c76f0ac9c9bf8746e363167a53f74
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10292 bytes
SHA-256: 606e428bb0b77e6c7366955379df447779a7200a2d54d8d18c2874b51b2cb214