Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b94ae3d10e1983…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 03:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12efe6131abc41a1f29d1cd1a0be78fa SHA-1: 7593ded48962c50534d8903f2b1a5c70baec744e SHA-256: 62b94ae3d10e19832f0755162f25cbb6fa2d0ca1c8afa6182baa3c1617e47bc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is likely responsible for executing the redirection or payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=how+to+download+streaming+video+android PDF link annotation
    • https://5ky13lu3-1251.com/contents/files/17179660034.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/danibulakepibufip.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/sevaxe.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/galojewejarev.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ripuvuzigi.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sobuzugotipefamuroxof.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/fakefubepanikelewakirum.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b007157df5---40464096316.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/bumotatupabuxakado.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/torevesewelakut.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/dadikutuwematazuves.pdfIn PDF document text
    • https://mklaassen.nl/images/file/sejadazovurawi.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/livibozavoxelajogazet.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090201151423.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/53095146895.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/74071436296.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/76552413579.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/34529485336.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/44662093615.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/gigelavutagi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-14/20210914082851106197.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/79292848649.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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 10732 bytes
SHA-256: 5e0a4c206b55df99752f02533ce5a1d3df248315120674290a1b7e7fd8f221f9
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 17216 bytes
SHA-256: 6a5374771fee96e3cd50d9c0e070ef56b27bf062c4736b9220172d7cf620d463
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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