Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bd595175fd5e52…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 19:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de86f521e2c14f712f1b23af4dd34c28 SHA-1: df486343932c3b55b3148b93bb633e318a7ece88 SHA-256: 13bd595175fd5e523c17ac481fddcdde21f5d6fd895391e4a3fdcab61cdbc6c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting PDF files, consistent with a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to lure users into clicking malicious links, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://hawkseyetravels.com/assets/ckfinder/userfiles/files/87636181381.pdf In PDF document text
    • https://clap-bas.com/userfiles/file/90122994625.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/tumimenexodunerudiw.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/12816593821.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/56851790026.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/wogokanoritaz.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/94167565072.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nomulifabunajatuzorolide.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rogagur.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/156e2fa0db301860426b3995b061fab2/bilekemoredife.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614054126153c---xubil.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/88493981362.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/xibegigedogu.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/74418617673.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zisevugudoluxus.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/dadop.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/zabudakawujadaz.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/ronapole.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/natojexawotuzitoxedidev.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xupiramebej.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76219575035.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/18167860846.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/78222368194.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/davufavimabimejoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+android+app+for+learning+pianoPDF 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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 17888 bytes
SHA-256: 95915d38670200d49c91d1bbbbbaab610ef85b151129854fc2e4e99df7fc4502
font_01_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 10728 bytes
SHA-256: feebefc3838a5aeea76182b7f6a4dc5e0966f445406a9b1529be78a2768877d1