Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54a1b628bb7a798…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 11:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d65cb092580e16f629622fcd47a64ff2 SHA-1: ed45d28c62e0e94105ede02f2cc83f6046d0b64d SHA-256: d54a1b628bb7a798fb505bb4375735dc890dcdde62c7514e476ac012121aba22
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious workflow aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://garglob.ru/uplcv?utm_term=game+berkebun+offline+android+terbaik PDF link annotation
    • https://sgicorp.com/userfiles/files/99408478735.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kerokapavotesubenapa.pdfIn PDF document text
    • http://mega.kz/media/upload/files/merodatijuvefatapara.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/33420559224.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/36284654210.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/75988545220.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gifejuzepenekumizul.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/kazutaxuxozisepamobu.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/80848051266.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/bufekovetizepawitebekuzo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/97083685763.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/28294ff68d054a2658f0b22dd0740ce6/zonibesutumajojegu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tesukubawixejekiti.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/17167487916.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/bagutisekogojige.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/sigolisoxetobituganu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jnv0p5cpdvst4vm6rqm2o7b5c1/46486697899.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/2244164667.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/4227193574.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31065217724.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/f165a791455665f856bf2074cd7d72f4.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/27972921189.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/81239876123.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/rowinoginiwupulobujo.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/lavuremagobigafivemiv.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 10716 bytes
SHA-256: cbf706b8ee3bcabe6e6883a126166389c53227fce2569c4fda08d49c35392782
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 17128 bytes
SHA-256: 2543b277d81da938a8ea19acbae3653499a6c4d38aab77be010d359ef058a444
font_02_sfnt_off00012ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1