Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a873d376c6196d…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 10:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cef0da474ab12ec6074b58d8b8229f2 SHA-1: 4584b4f51ef53b9ade820c044a11cefc9497e8fc SHA-256: a9a873d376c6196d8308d7d62cb114ec20b6df6c7d73f3fb04c99e86e71b10b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user to potentially harmful content. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a number. The presence of embedded JavaScript and numerous links points to an attempt to exploit the user through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://queure.ru/uplcv?utm_term=beat+the+boss+apk PDF link annotation
    • https://svenjakretschmer.com/ckfinder/userfiles/files/kojitizuwexupotunapip.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/ludiroraf.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/vevedefarabu.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/70725664935.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/jolutopelavulurelajuti.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/likapefesazupogipegog.pdfIn PDF document text
    • http://jawarakreasi.com/file/26048941734.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/72510205610.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bibebifodevubosobixe.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/2930458226133290f0eef7.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/20568129551.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/11383448804.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/65077049638.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/46113426952.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/tuben.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6514cf61b---vapeb.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/56864138535.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/jipiwaregivolapixo.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/90904001124.pdfIn PDF document text
    • http://itena.si/uporabnik/file/98011711336.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd88b10079---botaxaxirilubetus.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/42151922462.pdfIn PDF document text
    • http://emannsltd.com/userfiles/bulej.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/54611462515.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/texowafoxopabudukum.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/noxazazexirurapim.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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 15876 bytes
SHA-256: 138a9bd2e3798925e9ee2352735759321b4d9afefdb4edbeca519c420588a868
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10292 bytes
SHA-256: 602d69c330128587821541c7afae10a745c032605c60bba3c83e047dbf732c5c

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