Malicious PDF — malware analysis report

Static analysis result for SHA-256 e193c4f6c7acd0e9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 19:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32de93ccaad15f195711c1a25c730005 SHA-1: 513d96e285b57bd0a48f1d8c6b446018ef5873cd SHA-256: e193c4f6c7acd0e996ef33488e6718bd39a58200bb93e4097f2d765ac7219b47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=photo+shoot+apk+download PDF link annotation
    • https://superpackeg.com/userfiles/file/60177710729.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614522a57c160---47920663692.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/zivasawekazubopexexe.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210921_C8E705619AE52C6D.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/wexeluzesog.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/lalapawitaniriput.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/gasez.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fafuf.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/rebemamezojitogefepejuv.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/watunawo.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/sususaxisilane.pdfIn PDF document text
    • https://kede.org/userfiles/file/22769201916.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/kizaparenujadewugepadanik.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/10363683655.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/vivabetoziberapilopix.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/73288019709.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7260dcc3---48022702685.pdfIn PDF document text
    • https://forumsevens.com/images/file/maroveriwufam.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/20100961221.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xobidukepenituz.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210919072916.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/937620072.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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 10344 bytes
SHA-256: 08dbbe4052ff2be1335613aa9de898fc1d372f8931b707037386f2a3f399a208
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 16604 bytes
SHA-256: f83ddb3ef09af3746eb7ccde7539c1121b95fcaa5b210f74dea15e7f0f0c3d33
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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