Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea3678ea765a5b5…

MALICIOUS

PDF

86.5 KB Created: 2021-02-28 09:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9f819c67dc840779cc209829342432b9 SHA-1: 2c29630885a54fc8e582d07834d1f1ed1b1f2561 SHA-256: 3ea3678ea765a5b5b3071eb709cffa2142d3ff7792540286e1551da17b7e830e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=tokyo+ghoul+re+season+2+funimation PDF link annotation
    • http://jekenufakewe.mypressonline.com/52265108271.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/jijj3ic/smashburger_delivery_colorado_springs.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/gipuwamatiwibivutig.pdfIn PDF document text
    • http://tryplafond.xyz/tough_interview_questions_and_answers_for_teacherszw2si.pdfIn PDF document text
    • http://sochi2026.com/what_is_the_oath_of_a_jesuit_priest7odrt.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/U6gdife/truck_racer_ps3_review.pdfIn PDF document text
    • http://kayikciakademi.com/luguxibatiti88g2y.pdfIn PDF document text
    • http://rafale.store/area_of_parallelogram_worksheet_with_answersj1r2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_5fea12635a2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_601745a10d560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fde4a387515f.pdfIn PDF document text
    • http://xoxinusenavi.66ghz.com/74430493638.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/triangle_congruence_test_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hf1hcjn/online_hydraulic_calculation_for_sprinkler_system.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/61764128325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/53726540554.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/32832060136.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/descargar_diccionario_cambridge_ingls-espaol_gratis_para_pc.pdfIn PDF document text
    • http://zevusup.atwebpages.com/how_many_carbs_are_in_a_slice_of_margherita_pizza.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 5428 bytes
SHA-256: 4f2a795390a4c2b1c93ce1f059f31d460ede49e9710b7dd1c70751ec72848126
font_01_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 13948 bytes
SHA-256: 7760f1059e0d11f1af306660639b361dba9ed21d41fb933ea7402842990eaa34