Malicious PDF — malware analysis report

Static analysis result for SHA-256 b419b9975185e9f6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 03:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec990fd1e6881a07f6bc3bce7bf5de17 SHA-1: b87ddca6c2be3080166456037502d69954641f40 SHA-256: b419b9975185e9f6db3fe66355e7d4dc2bf11521d44d027c089805b5ee9c17fb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://oniceh.ru/uplcv?utm_term=du+battery+saver+pro+mod+apk PDF link annotation
    • http://hepiran.com/cache/fck_files/file/kuzulukazizur.pdfIn PDF document text
    • https://anpheatingandac.net/nbloom/fckuploads/file/joxew.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/15818588464.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sujofufitufogeriku.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/1674597261.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/56182689550.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/8096561625.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/3921612131.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/33419018785.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/85159577244.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/43402963607.pdfIn macro / runtime command snippet
    • http://de.ruben.pl/ckfinder/userfiles/files/bugovisosaliz.pdfIn macro / runtime command snippet
    • http://020tzs.com/baige/images/userfiles/file/64898548664.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/27184662846.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/pikitita.pdfIn PDF document text
    • http://moneymaker-gold.de/files/28095790484.pdfIn PDF document text
    • http://binhthuocsau.com/hinhanh/file/58926836845.pdfIn PDF document text
    • https://kratky.eu/files/file/dosugewesofoxi.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/44799662565.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/28625910230.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/46586438282.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/16445924236.pdfIn PDF document text
    • http://sampoernastrategIn macro / runtime command snippet
    • 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_off0000b6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 17460 bytes
SHA-256: 385a80a08e7eb8a5eaf35706800add501cb4f9048909787d7ccad3affa3a3db2
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 10824 bytes
SHA-256: 8f16ee93bd06d5bc91484624124d1afe5ebbceac83adac0c6c3b960364b735ff