Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd53aa8bf8ff7717…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 03:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96ca1fbc16e8e1762a527995fa681e2a SHA-1: 3f1a3aa6edb46e58b6c3e63209c1a52848d64a03 SHA-256: fd53aa8bf8ff77171d5ce537d6ce3ad9fece91248b3bfaedbcb4370daa583ca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ilkconstruction.com/Images/Media/files/judowuze.pdf In PDF document text
    • https://cabsfromheathrow.com/userfiles/file/29198378204.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210902161340.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904085419.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/78940906180.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/silatavije.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/5025393947.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/27887527331.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/taxidowibonexopefudidenut.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090321328_239729954.pdfIn PDF document text
    • https://asi-filter.pl/files/file/70780284102.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/kudisarepesuvonimodidure.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c89c63e48---tuxikaj.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/71232054511.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/gebupagorogere.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gewafeboboditelelepofose.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210909061030.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/758c33911963bf243bd16e230e82f92e/fazepidelipiduraxola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cat+face+app+androidPDF 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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10432 bytes
SHA-256: f4263ef09f19b52b164cd1669c9384109ad138c0e7fd4ca0f4307bf99e9f6309
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 17532 bytes
SHA-256: 9c5e5b26e8f0f023cc9d75a8c052e355e9c0d129d1b20970285882ccf1bd1146

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