Malicious PDF — malware analysis report

Static analysis result for SHA-256 164b0206d45cd46c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 08:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08067f4dcb55ef237aaae33e50932ace SHA-1: 973458a702264006c3d6dfe372d4bd80ef6f71fd SHA-256: 164b0206d45cd46c17203c22adfc21e2c4a20d613cd99edffd008d18f2a4335f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=the+secret+book+pdf+in+telugu+free+download PDF link annotation
    • http://domesticsolutionsagency.com/userfiles/file/34534964631.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/pagilaned.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/zovosafagiragawa.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zakar.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090315130191.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/20242221506.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137b00db9f0e---xomapulomurekanefemevitif.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/judewaxagumebezofedolamus.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/59820091337.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88777189010.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/94848746578.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/69511834377.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/gonub.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/pafop.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/tagizaxefopipanoroxumegel.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fifotajopizemodat.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/l7uim5a2thpce46to131df9vl0/88952294938.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fuvixe.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jesubotixenoxatifewu.pdfIn PDF document text
    • http://berbun.com/user_img/file/24226428766.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/figiv.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/5899686541.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/56281712989.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/sukovosapizofiruja.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/6624676909.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/85692120073.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/fagopegetopozolan.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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 18012 bytes
SHA-256: f3e1a4f29320ae6f0499e06d9e814511affeeb57a2fada2acf62a75b361e5ff5
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 11280 bytes
SHA-256: 45834076514bc5624377f07acdd8ea84914a05207da83026d731165512570dfc