Malicious PDF — malware analysis report

Static analysis result for SHA-256 819d020743857a52…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 12:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b067980a881f23528617abc54119f1ab SHA-1: d8c61e9affc1329faff6068b25ca35bda05806ee SHA-256: 819d020743857a52040fae45747ba9d625b2a54814db4a1d0900bd7481bc1356
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=android+tv+app+for+iphone PDF link annotation
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/noxizegodor.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wodotokujefo.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/63557986500.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/kuxuvejatosulibiwikinum.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210903042102.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210905223656.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/17850788148.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/86740985475.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/18099508046.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/bofitid.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210910_7D77B59BA7753C6D.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/zixabimapil.pdfIn PDF document text
    • https://emenu.hu/editor_up/kuvavukuze.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/suwizuforan.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911174756839975.pdfIn PDF document text
    • http://neteyes.eu/editor_up/riwavetujipinajaled.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zujijejiwubovenokipilu.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/jurepupilajuviraropun.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/11897160774.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0da40f7f---24527199724.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/kerapimubenikunorabip.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b5d6c167---xibexixitotawodi.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/2098304764.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/jubudewomomumamebagivudir.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/40125372806.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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 17060 bytes
SHA-256: 8a401a374c62c4fff7b430489d0971b58c1911b08bbd9f6d4a1e0b5f6c22e034
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10428 bytes
SHA-256: c20f81664fd43e3a410c64db47045ed04e47a1f06ab891f3e2e510a2e3a2b693
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1