Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac014b817fb3d5d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c08fd9143febd01732456dd02afe83e SHA-1: fc309a6fe9c742c8ec5bf4cc065882cdb52a230b SHA-256: 0ac014b817fb3d5d0d30eed54890d713b3473c6eb6a88c1b898aa00bae3a7077
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or content distribution network, potentially for SEO manipulation or hosting further malicious payloads. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://laserbeautymachine.net/d/files/kudepitagenek.pdf In PDF document text
    • http://4reality.cz/userfiles/files/48688338252.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/33900199383.pdfIn PDF document text
    • https://pecintajp.com/contents/files/76136620447.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/momumukufepa.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/96349888661.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/73960550793.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/vevosexomifof.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/12678050079.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137109bdcae0---83336855298.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/ferifase.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/meziwaxososonitaxafimude.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131131575897.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/25116194715.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/fisajeb.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dozugazaper.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/valalenojuge.pdfIn PDF document text
    • http://symbolfoods.com/files/file///zomeligeridotig.pdfIn PDF document text
    • https://avflash.nl/upload/files/kupapiveruvufibebexupug.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/ximajesogulavijibexiv.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/74385174047.pdfIn PDF document text
    • http://snft.ro/media/file/jusejoludamuxas.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8slehgrg9tj2ettc7knej99ufd/rovuvef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=picsay+pro+freePDF 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_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10340 bytes
SHA-256: db226da96057dd5173a7bd810ea77690e77645b12b2944a03261dcd2edc68998
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 17952 bytes
SHA-256: e1e61efd6a192f0a6c9df41b4ee932b17790c4868d4520df164af7df3859df46

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