Malicious PDF — malware analysis report

Static analysis result for SHA-256 77775faae481214c…

MALICIOUS

PDF

83.5 KB Created: 2021-05-11 07:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c9de612f18edb2a66c02a54edd6ae71f SHA-1: 2394dca7aa93d892bc40198618e2dc178298f3f3 SHA-256: 77775faae481214c174ae5b66e3bf63f9c8ba44c092482f0da337959d29d2659
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links strongly suggests an intent to compromise the user through external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=sinner+in+the+hands+of+an+angry+god+rhetorical+analysis In PDF document text
    • http://mozobadijoba.medianewsonline.com/gosopixujipiwuzujuvati.pdfIn PDF document text
    • http://fullstacket.online/doxatadowukawaczs4w.pdfIn PDF document text
    • http://arbitestpark.xyz/13966567492spt6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_60447269a429d.pdfIn PDF document text
    • http://boost-store.net/32950775609k9ihe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_601f89f8a9594.pdfIn PDF document text
    • http://goodsun.space/metodologia_de_la_investigacion_estado_del_arte5g1s8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_601049e548529.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/2101561610.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/640aa711-09f8-4437-9ac9-5c2cce608521/sig_sauer_p229_40_cal_extended_magazine.pdfIn PDF document text
    • http://xalixonawi.atwebpages.com/22355935206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59810311-efa3-480e-a78e-73f517a9a68a/fajosunizis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23abee20-71dc-4234-ae1f-5f3afe234343/interview_questions_and_answers_for_teacher_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b635e6b-f866-4025-92cb-d8f9a7f07ebc/63303788603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e7bda0-9c60-43fa-b56a-cba548c9c914/95989849017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c19528-686e-4575-8f2f-48e4bd3008b8/the_science_of_mind_management_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09558422-ff37-420e-a344-9cc71c49f687/science_a_closer_look_grade_5_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29c2256-a64a-49d6-9e69-fc25478bf5fe/que_compuesto_es_el_cianuro_de_hidrgeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c5df00-2598-4953-80b9-b693fb1f6898/how_to_reset_a_kenmore_dryer.pdfIn PDF document text
    • http://momalovategur.rf.gd/libro_el_alquimista_paulo_coelho.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4248f5ce-bbb6-4f34-903f-04d9ad85c353/saltwater_fly_fishing_gear_for_beginners.pdfIn PDF document text
    • http://xisirajotijejuw.rf.gd/business_proposal_writing.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_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 5488 bytes
SHA-256: de50a1b20d25c5f7eb90f78c25d8e70c91a4ef03c45c4b2da3dd68842155984b
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10924 bytes
SHA-256: 48d13ecc3929b7bccec3597848acb226aadfc2b0d58d7769f9e23207dfe9857d