Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da2d2312ec01d7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 04:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d2c00a30ede669044e68c5cfb648584 SHA-1: fbf52e4deb011e67b637286b902071b78078b1b0 SHA-256: 11da2d2312ec01d7b9b98089a4021c85767b50a5f9d1a3770acc7b3dfa821c9f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=cheat+hotel+story+mod+apk PDF link annotation
    • http://e2ingenieros.com/ckfinder/userfiles/files/56432245812.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/170505394177.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/turiboradupurol.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/17072505068.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/56542209720.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/1763499254.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/45296039886.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd23826f77---bifejezap.pdfIn PDF document text
    • http://stl-hk.net/userfiles/jenudogusomama.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908004832017.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/dedixado.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/96670628978.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f8bfa00dfc968494b118fe830daaddf7/wexurubojeb.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210915_432EF90CA67BE534.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/83281355657.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/fakuvopozi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/41051564543.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/92533704048.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/maranegi.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/28824949043.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/kisenivumezozikeganefuta.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xutalekizen.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_off0000be52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE52 10700 bytes
SHA-256: cd7330e14b3eb50e246a3d27404e6b5662fe09578cdc081764703c618bb24e85
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 18024 bytes
SHA-256: d777b91a63a891593f0301a0dd61511776dc88a1694718c8db7daac6c87e1315
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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