Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3003bbda59f4c49…

MALICIOUS

PDF

93.0 KB Created: 2021-09-14 07:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07b60e0d8902d6341ad0a6bd7ebaf76a SHA-1: 06da028c6a622baf015cfb2f1a379a3555ab074f SHA-256: a3003bbda59f4c49cce59f7c2353b6da79dcb77f3dede05875b049249f600d56
134 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. Heuristics indicate it functions as a link farm, likely a lure to download further malicious content. The presence of numerous unknown URLs suggests a phishing or scam attempt, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ysh.my/userfiles/file/41082495778.pdf In PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/kawolipizebupupek.pdfIn PDF document text
    • http://belv.ru/userfiles/file/62709069272.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49677658d---roweluroxegimisiwalux.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/lazegivamufanalu.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/perukiwaz.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/68012988125.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/89538134346.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/8gkk8em42u0j1gf0b7ub1iejmd/55475521228.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/73048846217.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/20465743622.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vutejezipibafarobetad.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/xadifuvama.pdfIn PDF document text
    • http://p-energo.ru/content/file/96972666262.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/66231145681.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/sojosijigiv.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/63682652877.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/wizep.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/bosasimux.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/virizapasasopumukomidod.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/4931456720.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/susujabo.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/54750168506.pdfIn PDF document text
    • http://vhshf.de/File/95400937988.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/supamukam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=facetime+apk+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_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10528 bytes
SHA-256: fe1f9a0626a3f5a2eb1a2b25a002b63182db2d8a71066a77b53875b1ae18833d
font_01_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 17764 bytes
SHA-256: e6cf2debebc6a76e6f37eb5920762d2595762c04a68d37b35db87445cb4a17aa