Malicious PDF — malware analysis report

Static analysis result for SHA-256 3607f78bee416562…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 12:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fd8649032ef148fda8dfc29bee04b10 SHA-1: ce3a37ab6d9ef5e3bfb50e700d1df3d94bb86760 SHA-256: 3607f78bee4165622fa7adb6dc41ecf1edeacf573a015a2417a3e8e587bbc2bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that redirect to various domains, suggesting it functions as a link farm designed to lure users to potentially malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=identify+vertex+and+axis+of+symmetry PDF link annotation
    • http://www.logomarcanet.com/userfiles/file/4150196557.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/kosisegijelaxovaxajeva.pdfIn PDF document text
    • http://firegallery.ru/img/upload/44945776466.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/90627812415.pdfIn PDF document text
    • https://andhimazhai.com/images/files/85082730073.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161344ee449d8e---sakejotaredatene.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/80403287295.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vojufunixukafufefiniguvup.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fajulatonofagisotalival.pdfIn PDF document text
    • http://ledins.lv/cms/file/zavakofodepojugojawan.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zolofovidolumopawuvenu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903232732_fl9e5w.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/18557180708.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/sevalek.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sozenilasoruliwaga.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/kovosorovuwego.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/43275840414.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/44317386497.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xuwilexataxunef.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/13585236926.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/digugovejulifiluvomomilob.pdfIn PDF document text
    • http://plncse.hu/php_data/file/44753941800.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/binorurezawegedovo.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/bezenejan.pdfIn PDF document text
    • 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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 17096 bytes
SHA-256: 0f9981effe874bc6195418ac549c6c8a75ba34d33b2c781fc032d72e57c2ff6c
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10700 bytes
SHA-256: 1a582dd80b24757e28447b51aa14a8505339755b3307b647b9a3537eef413ab0

Open this report in the interactive analyzer, or submit your own file for analysis.