Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae15d13b5f76dda…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 22:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11c4b39816d64dc97ec5da009f7918d0 SHA-1: 3b31ca2e6c54f5dabf1bec612dec41dbf5f92657 SHA-256: dae15d13b5f76dda621e92a689b0d89e68330c359784afe2820bfbeeca9ab75f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm pattern. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download additional payloads or redirect the user. The numerous external links, many pointing to PDF files on various domains, indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://glozor.com/userfiles/file/jikepebakewuj.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613991d37e0a4---17019809506.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/vinivogugin.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/47218734561.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/38043989175.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/24731521555.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/punofogapap.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/73403959097.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/30511744547.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/desezidanom.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/notobusifujid.pdfIn PDF document text
    • http://rayanchem.com/d/files/gamaluwifavawidik.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/galevafebewar.pdfIn PDF document text
    • http://inercial.es/uploads/files/62973401154.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/58427223430.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/51502010003.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/98288484152.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/93096566018.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/29423076722.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a2232b12---85782936157.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/76538954351.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/gawukuwoxumo.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/56993243200.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/vanoriduzikifejorifimedup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+racing+game+under+100mbPDF 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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 11016 bytes
SHA-256: e8483f0333642e0ef4697445b10658157a5120beeddc1cfa4bc2246d96968181
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 18100 bytes
SHA-256: 3e92cbd2d8eb3009e49eb7adab4b157295be8ed83fd6e1c466152330b13b2ed8
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1