Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79ddb5f0fb196ec…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 17:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddf6aaa20482628249520cdb95d580ea SHA-1: 3745de74a86c1a75fa3598871f794dea8a886ad3 SHA-256: f79ddb5f0fb196ecc4c285217fd4a5426d925c0eb8973263f80d4150fd3a9cee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/65073200348.pdf In PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/65451516105.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0411941001631710184.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nutusufo.pdfIn PDF document text
    • http://classoft.ro/userfiles/file/nojetatitital.pdfIn PDF document text
    • http://holzbau-napetschnig.at/lejulajewatof.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/kamaluser.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/27236067187.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/6817511436.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/39136173422.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mexinalemuna.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/30483831229.pdfIn PDF document text
    • http://geose.ru/userfiles/file/jukubu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109131611454186.pdfIn PDF document text
    • http://schokozentrale.de/idata/66921833572.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/tevezegubanarugevom.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/85058655460.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/87189421152.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43661025283.pdfIn PDF document text
    • http://ipceurope.be/assets/file/75091015132.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/90358835982.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/lusipopipatuburito.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614045c982144---44166344708.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/zikejajupilimebidajabax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+to+write+in+mail+body+while+sending+resumePDF link annotation
    • 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_off0000adf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 11128 bytes
SHA-256: 840ad1b755c8cd4b5391a8a788133dbe43a9e7866ceb1944c3afb5a6e93ec78b
font_02_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 14512 bytes
SHA-256: a1d44e1a09733474ffec3a9b1150e36b549b3b8a3abfd31341e1e104e829ed53

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