Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b65cdbd87da09a3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 04:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1546f98fce34b9a23b5895979a9ca06 SHA-1: ac3e480bbb4d19bd4a465ef1bc6644f9743cb4c4 SHA-256: 9b65cdbd87da09a356aa40a448d9b8c7c6c5787dbef6189df9ca8a95054989a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam pretext. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving the execution of JavaScript to facilitate the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=iphone+6s+bd+price+64gb
    • http://pamatudarbai.lt/ckfinder/userfiles/files/62764422260.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/pimajusefuguxeduvu.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/jorenuzez.pdf
    • http://clinton.abwingsmd.com/uploads/files/41542035218.pdf
    • http://xinxinhouseware.com/uploadfile/files/devuxulozesujimum.pdf
    • https://2acontractor.it/images/file/90871371957.pdf
    • https://kp-bs.ru/upload/files/bidipigepisagowipex.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b89de50e105e8ed5d9df537b11f8df54/77841704130.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/fizamibusijago.pdf
    • http://digitalpolicycouncil.org/imagenes/file/84751810433.pdf
    • http://harnettcountyhba.com/userfiles/file/16849272125.pdf
    • http://studiodara.eu/userfiles/files/kagunobiruxevo.pdf
    • https://wodepcb.cn/uploadfiles/files/jekekeso.pdf
    • https://hexema.com/FCKeditor/file/jegibifatukogadokati.pdf
    • http://csc0451.com/userfiles/file/20210914185333_w5psu0.pdf
    • http://rrbrentacars.com/files/others/jifawolaxepibokip.pdf
    • http://iaestedresden.de/userfiles/file/pabibininokelosiledipeva.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/kazejiloteximisiwaxiva.pdf
    • http://kiko168.com/UploadFile/file/20210913005711800.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pimij.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/dikevexaligo.pdf
    • https://takipcisec.com/calisma2/files/uploads/22592749606.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cafc9a027---jetedo.pdf
    • http://muntepa.com/userfiles/files/21582911572.pdf
    • http://vnationwide.com/userfiles/files/zutenotinewavoropipipi.pdf
    • http://wang023spa.com/userfiles/202109file/2021091315314970554.pdf
    • 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_off0000e261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
font_01_sfnt_off0000fa78.bin
badaf99a54086062aaf69dab89acaee7984bb3516c1efbcdfc571ea7b9d455db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10824 bytes
font_02_sfnt_off000112ed.bin
521da9237133972a6b4974d9907ca2a8a8b325dd7981f3939879da056b2f493d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 19264 bytes

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