Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21ad3b9d725a744…

MALICIOUS

PDF

95.9 KB Created: 2021-03-14 03:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73400df41f3c2175c1d5bfaf5bcd2131 SHA-1: 58f1dbeab8cc8026ae74e8399f19637356194c90 SHA-256: e21ad3b9d725a744b98d7ba28bbe8b649d8f44fb43863b6c9e9bbcf6e5c8436d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/wix?keyword=optimum+tv+guide+long+island PDF link annotation
    • https://cdn.sqhk.co/rufomezin/eXzkrid/finokidibe.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/jaghjat/real_steel_world_robot_boxing_game_hack_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/NgdjbGS/speed_boats_for_sale_in_maryland.pdfIn PDF document text
    • http://walunajogikowes.22web.org/52596489765.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/bG3xoSC/gavutixebagasudibakurumo.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/jgjhdhe/best_voice_changer_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/whfgdia/surface_area_of_rectangular_prism_formula_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzivogawa/jcjgzig/prison_architect_mobile_apk_full_version_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zakivijojinikij.epizy.com/whatsapp_status_app_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/80040278944.pdfIn PDF document text
    • http://davojuke.epizy.com/46762199541.pdfIn PDF document text
    • http://sejojoxo.epizy.com/free_avatar_game_for_android_mobile.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_fedf73c763004994b6acbed818dfc0a2.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_617ed037125f4533a8e828077c47d8bc.pdf?index=trueIn PDF document text
    • http://vigiwadovu.epizy.com/83943201678.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/49301366159.pdfIn PDF document text
    • http://sabodivatipapan.epizy.com/kerafizajibifazivujab.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/lg_washing_machine_repair_guide.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_bfe82dee27e94942bcc68c97b0129bfd.pdf?index=trueIn PDF document text
    • http://vadupeti.epizy.com/canada_red_cherry_tree_information.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://scripts.sil.org/OFLIn 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_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 5272 bytes
SHA-256: 6c932190de0f6069d6598f48fa09650db2d9510be4c901c5b706a43353e3fdfe
font_01_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 13324 bytes
SHA-256: f86cb32bb8babc2054201991f3de29d5bb1dc5da46f6fdd60fe59ed80be2bfa9
font_02_sfnt_off00015c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C76 16332 bytes
SHA-256: 14275a254d6572d6f2f381ac82c4cb420be5e045c2f67a576ce2d3bab58ce48e

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