Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1ab65f0a0fc938…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e78d2890cc8f4d8e6b9a192daec77dae SHA-1: 639272c5caad81308452b09006268b7b5605eea0 SHA-256: 4e1ab65f0a0fc938fae25a0866b950aa80429973a9b8733c57259eb533994fac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. The embedded JavaScript likely facilitates the execution of malicious actions or the redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=how+to+deactivate+gmail+account+in+android+phone PDF link annotation
    • http://tofuyatogo.com/uploads/files/94947107236.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/woxalakoboxuwute.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/3047405542.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jijefexeketej.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/24278184947.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/38281298259.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/75991253046.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lisusegiguforuti.pdfIn PDF document text
    • http://modern-pro.ru/files/file/garopifurisarafako.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/wavajutoxolurukig.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/9477058375.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/nabexutagugonetetokebu.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/18894825161.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1mivqm02igb51um1ftntbrak26/vojasiwujazi.pdfIn PDF document text
    • http://master-vin.ru/files/file/linodeziboxebezumij.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/34977978985.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/darisogokid.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wototigozerurosebapava.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/juluzuvufavifelavamakirak.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wevejorefevenej.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/biluterip.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/vidiveresetoximorabove.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/48936844609.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/90743294045.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/51190918726.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sigasuzulaxixexakis.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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 11036 bytes
SHA-256: 6e5f0bd912682f6a0d4fd79d9e1f26f406b7ff2eca591d56576ec1906b1dade3
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 17444 bytes
SHA-256: 085f129896e29863e2c537101996d3ac75590849459c5b6c2ec5751bec265992

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