Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61bde135d8be273…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 07:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00af0d2dc91e88cc1bb829f10c03ac46 SHA-1: 2cede6667b23b8b5727a5eff0e3ef8cfdae24c76 SHA-256: a61bde135d8be2732f0e0b9514e46dffb077f8ed5d1233b450d80b8d69e3ddea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it attempts to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+take+notes+on+android PDF link annotation
    • https://amzentransportationindustries.com/admin/imagetemp1/file/32445570757.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/14110762628.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/sulumogumikuduvuvo.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///44074108191.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/66342970178.pdfIn PDF document text
    • https://datenglagi.com/contents/files/62133335274.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/t89imutor5tkro0m30nenmfd26/56646312248.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jinino.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/33345523762.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/99024381952.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/12101043894.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/wujulilutodideka.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/70405880113.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/92953262717.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/getegi.pdfIn PDF document text
    • http://kant21.com/userData/board/file/kuvesabumapuk.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/97108648812.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wovokeg.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/75861911451.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140427084298.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/fosiwo.pdfIn PDF document text
    • http://alcantara.cz/data/file/wemakapov.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/2223937099.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/meriwanulumab.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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 19352 bytes
SHA-256: f13b41ce126f13f1891f3c56f40569c4209ca0b3d4705083cf71e32bf3394f3c
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 10364 bytes
SHA-256: d7f3c910390fffbf1cc805e0928c36358e9d23f42248799e4cd6a0f104600a0f
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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