Malicious PDF — malware analysis report

Static analysis result for SHA-256 65efa2e9809ae8c9…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 12:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57493fec230314df28c37a92cf717e78 SHA-1: 737f33009047a72d344a3cf7c8a84c33178eecd2 SHA-256: 65efa2e9809ae8c9f6279cf2fbbba4f55c8556ebf67b9341b44dd91fdda94488
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lovesushiscv.com/uploads/files/kotufavawijozuwom.pdf In PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/88932802869.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/69086439711.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210906225343.pdfIn PDF document text
    • https://togeltop.net/contents/files/zewuduwovoxutatize.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ganedojov.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/suvuvugenu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/nopavapadezoku.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f55715a0---sojurozaxajosibugekufatex.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kokowasazidilopelikij.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/ruvud.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/83879381178.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/nasubijokibiwo.pdfIn PDF document text
    • http://wmsone.com/eimages/file/somone.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/97917084419.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/nidugibanafewajudizan.pdfIn PDF document text
    • http://sdes.in/uploads/60163500879.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/1891330618.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/webixomujeveziguf.pdfIn PDF document text
    • http://knauto.com/upload/file///72907864878.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/79550188055.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/kakuzomekejebunixugup.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/lipuvolabubijida.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/4598362451.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/runigonedukusuritarunan.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/sesinunulemawawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aplicacion+para+rezar+el+rosario+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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 10448 bytes
SHA-256: 860c29049df36efd15a7b7a7de6cc01bbcd6808a67f2adc0d2494fc49d00a4fe
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 18664 bytes
SHA-256: d5c9a333cf6659c99a6f011f745006d426aec53ab25a6448325f22f7d108fd6a
font_02_sfnt_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1