Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f29bdeaf0df4ba…

MALICIOUS

PDF

86.8 KB Created: 2021-05-11 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7393b12f72e95d53e8ffee63d6ff0d20 SHA-1: 26bd90b933f7a4bd9d356f020f205c759c799c78 SHA-256: a8f29bdeaf0df4ba69c3f5118f2eb4a12a521c8dad886ff74c07a021112ebf3f
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 0.9992

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 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://baarspo.ru/strik?utm_term=swann+4k+camera+system+review PDF link annotation
    • https://cdn.sqhk.co/xusarukave/hgwghih/messenger_2020_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zujarepifej/didrhjr/dewareveme.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/djc5hcu/ejercicios_de_caida_libre_para_secundaria.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/68354711412.pdfIn PDF document text
    • https://cdn.sqhk.co/pasudajuwesa/hcxdoie/modokojapadu.pdfIn PDF document text
    • http://gowitobo.iblogger.org/33051077986.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/W7WWice/background_color_for_us_passport_photo.pdfIn PDF document text
    • http://wumofuzusagumo.22web.org/puvaxegedezo.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/nosubonil.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/9ca00dcf-12ab-4927-8562-fa1cf94f5b88/kubaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5950d3-6560-49de-b984-a0898909e85e/jeganafedepezusepedekit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd491fba-3b08-4c5a-83ad-4961e1069f53/34678572473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71310351-a5ed-4030-bb87-03d140585150/what_age_rating_is_pegi_3.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_cecfb931642148609333e2755e341450.pdf?index=trueIn PDF document text
    • http://vubudeze.rf.gd/blender_animation_movie_tutorial.pdfIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_056e80108a70460da68ee1964e7a2715.pdf?index=trueIn PDF document text
    • http://wekidezeze.epizy.com/sustainability_reporting_requirements_singapore.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_0469723647dd476f81e649a482e4aef6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b477c6cf-833d-46c2-bb3c-e90164047cf1/rerezowibes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3165a1c5-c299-4b55-a4ae-c611b69639bb/linux_command_line_cheat_sheet_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf97368d-0e7c-40c8-92ae-06bf98d895c6/66548164420.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/kivuwel.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_7d68a8e56209491785bcb0c57663a9cf.pdf?index=trueIn 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_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 5424 bytes
SHA-256: 78ee8be37b8366ba8ef8c75556c66502cb249b71931c7307700757753f4c1ef3
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 11464 bytes
SHA-256: 910b68de96c08939e4dcda7d133190e05270cdc0cb5b0a50966007a11ede56df
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61