Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a57191c0fddb7…

MALICIOUS

PDF

83.9 KB Created: 2021-03-22 06:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 246c6d0cfa95c58edf3985e4267cbdb4 SHA-1: dde09c169174d8c1088f4c61a501d2c00905b8df SHA-256: dd8a57191c0fddb7864d4688f5c2b3080dc1527809b67d3ff91a4dc3fa9f2d92
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://ponafet.ru/strik?utm_term=what+is+web+design+meaning PDF link annotation
    • https://cdn.sqhk.co/mezawuso/ifjejhI/69162700074.pdfIn PDF document text
    • http://lasns.fun/grammarly_for_mobilenjqj9.pdfIn PDF document text
    • https://cdn.sqhk.co/kerinetivama/wtErgfy/59361839254.pdfIn PDF document text
    • http://thrivewebs.com/zudamulijivobed33xqg.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/hcHgigc/kontrapunkt_malmo_adress.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/a3bpjjc/highway_traffic_racer_2019_police_car_chases.pdfIn PDF document text
    • http://pollsexpert.com/thompson_center_hawken_parts_for_salecnb71.pdfIn PDF document text
    • http://cocobuka3.xyz/mandated_reporter_categoryx1l0f.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/UMtMhhc/dawupow.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/7770ea3d-f791-4775-9a11-b62d8c67c5ab/openintro_statistics_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5bf3dc-ddaf-48ea-8aeb-7441fe57b70b/26437239458.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/whats_another_word_for_stamina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed74b31-006f-4bdd-b2b5-d7e47d489dc0/57447162635.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_59c2c535a7fd480494cb713217da5200.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_c9938c47705d46d1869a8a91c2ed59cb.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_7ce1e15050ed45c99d773c40f1e2ced6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec369a4e-d948-4802-ac17-42312493b35a/2011_dodge_avenger_alternator_removal.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/98031887433.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/fourier_analysis_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49ad1a8-d25f-444c-b90c-e09d0320e34e/simple_and_compound_probability_worksheet.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_4e2d486b5f274141b4f28310777bf464.pdf?index=trueIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_8021332b50e9414cb2f6c4b769b1af31.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_b5fc02cfd0f14804ab93e706f7a0d6a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/kbc_registration_question_5_answer.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_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 5356 bytes
SHA-256: 18413893345c345a23c6b862f25bb6ca3d5c51b471fc8f883bd8c9fa6e93d520
font_01_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 11000 bytes
SHA-256: 0efde8227d21c7623e421f3359c7ccc0648c84f3c8d05bdc251f555c6df99aca
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16336 bytes
SHA-256: b7ec44cfe2208ace95a2ce43e698390e22c67aa42018be4a86f0f90cbe714ace