Malicious PDF — malware analysis report

Static analysis result for SHA-256 57144517edebd375…

MALICIOUS

PDF

80.7 KB Created: 2021-04-19 06:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8f2bd0d7485c40670f4dea395ad3f211 SHA-1: 211d4bb55c5ee5034e9777e87eb558463f0c6e11 SHA-256: 57144517edebd37548a26c04fe67ba3183dc90ac7d137c4c2cab16f777d4a026
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=equilibrium+expression+problems+worksheet+answers PDF link annotation
    • http://mizejodaf.mywebcommunity.org/enlightenment_buddhism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_6056e3e6e3266.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/tusadoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5fe15a9ad3113.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/resumo_atomistica.pdfIn PDF document text
    • http://zowogusatutojus.mywebcommunity.org/68208982476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_602b39ce0bfe4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac578ac-9bd6-44a6-be9d-f8d90fd4d7e8/microsoft_sculpt_ergonomic_keyboard_not_working_windows_10.pdfIn PDF document text
    • http://rugefar.myartsonline.com/44699130412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4f415f-d467-459a-8811-53fe68297ad4/76116204369.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/maltose_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/chimani_pakhar_movie_video_song.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/guvelaxedigakorudomepibat.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/79310130121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b947c6af-0916-4174-8472-cb874ab9e6d8/mononajodutevilix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e687ce7-aa98-4a1b-8391-7f1ea7b352e9/93192574771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7380af9-f68b-4b67-9702-061e04bac39e/32833464190.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/heart_perler_bead_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9164dd8b-dd92-4c8b-87f6-2c185a718af1/what_does_soft_skill_mean_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/ng_cli_cheat_sheet.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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5508 bytes
SHA-256: 89c3b8d6ec1f183c77272fb61fee2cffa97abf03b680cafe76ed5907c9590b17
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10852 bytes
SHA-256: efc52ca2a181b4fd0fb7fd31c8909153f191a12852a041b294c76df34c5a08ce
font_02_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 16116 bytes
SHA-256: 64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df

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