Malicious PDF — malware analysis report

Static analysis result for SHA-256 286b52f85c8beaf1…

MALICIOUS

PDF

113.0 KB Created: 2021-09-19 13:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5e457eede9dc076def9af094404a63e8 SHA-1: 15018bdf416ef3d56c9411bdbe4ae86c0e35c203 SHA-256: 286b52f85c8beaf1524b5c43c7956c2311de0641a6b66cf887f26ddb1a98744b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document impersonates Amazon to lure users into clicking a link that leads to a credential phishing site. The embedded JavaScript and numerous external URLs, including a link farm on disposable hosting, indicate a malicious intent to deceive users. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://oniceh.ru/uplcv?utm_term=aimbot+pubg+mobile.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=aimbot+pubg+mobile PDF link annotation
    • http://geredekombiservisi.com/userfiles/file/kimuz.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/xikizikemiwadavodawemi.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/24454176302.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/gimanadipamosaxejunowaf.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/dubewatukizepe.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/34704909844.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/wizotugaxojaxewol.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109120432195157.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/befobivik.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/bumarevovegagelorexik.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161321be753a33---gufotesibotakesuvevovape.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/92251488180.pdfIn PDF document text
    • http://kes.org/upload/editor/files/namevitesibuvawis.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/mewag.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/jinowile.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/39020367311.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/pegabijawixabuluvorudoxi.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/90748229640.pdfIn PDF document text
    • http://cke.hk/userfiles/93658270515.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/zozitiwemekex.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/19433932152.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/92576355373.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/11718203779.pdfIn PDF document text
    • http://coolscape.info/images/files/kemaxa.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_off000155c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C0 10280 bytes
SHA-256: 8fb6b941bc2ca65fbd85af335f404e45d445e0870497ba77973fa3b92c66efda
font_01_sfnt_off00016cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000184bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BF 18820 bytes
SHA-256: b34b5999f779c906d68ae9ac60b222e0fbac9671a581eb84ac3c614e0a8b57b6

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