Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bde2200c995de9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 06:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d882c93e19bdc04988e79ec062e84d9 SHA-1: cec1ee53805ab40448260b52ba0b435c24e051e6 SHA-256: 19bde2200c995de9018d4af9ce8d261caa2a556fd2c2c80028dbc223f1c546f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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.
  • 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 http://sincaremedicaltour.com/js/upload/zuzisivo.pdf In PDF document text
    • http://thamdinhgiadaiquang.com/img/files/87731567476.pdfIn PDF document text
    • http://safarang.com/basefile/files/kaxodemoxe.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/22028181382.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210910174438.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jeziserajape.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wimuzipabiterupejubuf.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/viwum.pdfIn PDF document text
    • http://kes.org/upload/editor/files/94495045389.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/57555653083.pdfIn PDF document text
    • https://ptogel2.com/contents/files/56107472088.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/42917292102.pdfIn PDF document text
    • https://htchninc.com/d/files/rojevifisiguto.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910125656.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/roralubimegodibewajim.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9877526cb---xameluniw.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wanerixa.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/kexapedejilat.pdfIn PDF document text
    • http://quetthe.com/upload/files/65737312229.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/vijepepemojajunilager.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210911070744983.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/kukizomazafulilegunib.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e14cd72bc72a3591e37003efe5d522a1/36823347000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=a+digestive+tract+is+complete+if+itPDF link annotation
    • 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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 17740 bytes
SHA-256: dc514c9d61a619c4d2271485e2b88651238bc5c94f0c457df444e47bfc3e0a98
font_02_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 10908 bytes
SHA-256: c789edb0dfe677f1b83add03db0a0c9efc2d43de920a13e556b622673363fc37

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