Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea77b5b8f1980e8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 16:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5631b0b6a5b1c5d016092718f6953861 SHA-1: 01275eaead7481cf6c88fbacfafbc654bdf89a1f SHA-256: 1ea77b5b8f1980e8373dd1cba7b5a4f18e1b531b1076850efac1bdd2d8a85573
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous links pointing to PDF files. The presence of a 'download button' heuristic further suggests a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://craft-personal.de/userfiles/file/39312178965.pdf
    • http://elosc.com/upFile/file///ITX202109020921087768.pdf
    • http://princeverma.in/uploads/files/42260041193.pdf
    • http://toitureetfacade.fr/data/Files/nawafowip.pdf
    • http://parfumerieindex.nl/images/uploads/jagilo.pdf
    • http://studiofagiani.eu/userfiles/files/momavizixujuwijisanud.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/xuvetiviganijijuji.pdf
    • http://moderncarrent.com/user_img/files/85815000632.pdf
    • http://clinicaveterinariacene.com/userfiles/files/gebogotowiwusazojom.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/1495742525.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/pizebifezezeruxuti.pdf
    • http://lammermoor.net/imagenes/file/54193021195.pdf
    • http://gwtcs.org/Content/uploads/files/42977914519.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a400f93c17---gusubituzosefe.pdf
    • http://pantryscan.com/123cars/imagefck/file/55206536627.pdf
    • https://siam-royal-view.ru/data/files/7779317800.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161403b84e3180---xuvefeladipapiruxuna.pdf
    • http://monthclean.com/uploads/files/202109110349034092.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/jivetimesawonojopujawis.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/lubafaboluwawedow.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/gotusumin.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/59408846948.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/89369075600.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grand+theft+auto+vice+city+ppsspp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 16792 bytes
font_01_sfnt_off0000d694.bin
3ea8bc5da8dcc42ace5f79cc76ec55b98c106093505733e637ad9f46c8baa248		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 10988 bytes
font_02_sfnt_off0000f018.bin
b69b595c709105fc78ae4ff3b79c903fa31c8afe2410bd35951f822c168cb5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16292 bytes

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