Malicious PDF — malware analysis report

Static analysis result for SHA-256 48da47e340203786…

MALICIOUS

PDF

82.2 KB Created: 2021-10-09 17:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 868ee1f34073c2790468d94333541097 SHA-1: 12390d24b8b5f899fee44bfecb4f7ca818c97f1a SHA-256: 48da47e3402037861c88ba26a45697f6451a8c5ca69d3d8f46472f7ff0126c1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://philabc.ru/uplcv?utm_term=can+i+end+a+sentence+with+an+adverb PDF link annotation
    • https://canevastoilestjean.com/upload/editor/file/4295387045.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/diseva.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/78148682644.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/goloxikagoxatofikep.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/34293079266.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1cf172ba7eac57aacf14d56174e455c0/burufasixavalepurer.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109222155072453.pdfIn PDF document text
    • https://ccskin.com/geektic/files/43252306671.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/dudoneluwanunanipemilek.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/6324422616.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/meriravudumumeter.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/45567608279.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/lawibezox.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/36925531382.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/21365665455.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/44212059112.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/32563204943.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/rogupinokobulun.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/89451797252.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zepirujekujepoxazal.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/11266277445.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 10624 bytes
SHA-256: 0dc59ed6dba3102a63b9dfc48e1b8ebb953f854fbf2065245f2b60d2182119e8
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 17696 bytes
SHA-256: 24e170eb3f3a3057d616c4e53223ca2f800c658ad44a5748d7ccf08af601f61f
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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