Malicious PDF — malware analysis report

Static analysis result for SHA-256 645946b9f59d7235…

MALICIOUS

PDF

77.7 KB Created: 2021-04-04 06:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce6394373a4b7aa4f1a43f1b765c10c3 SHA-1: 95e6aaf5794fd8de81b10c359e63b8f69ede549a SHA-256: 645946b9f59d7235911dee7b273e8e8eeddef8d0614eda5db1af5ab4cb68347e
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 0.9956

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://nipisod.ru/strik?utm_term=evenflo+advanced+triumph+lx+reviews PDF link annotation
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/4b6b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5fd3b6f4a316a.pdfIn PDF document text
    • http://laguduzimunek.22web.org/cuanto_cloro_se_pone_por_litro_de_agua_para_piscina.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/bexer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_605fa7cf137e2.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/higcoFb/translate_apple_core_to_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/iiefbFn/tik_tapas_ericeira_menu.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/bb212c90dfc5840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_600aeafa79651.pdfIn PDF document text
    • https://cdn.sqhk.co/gevanadu/Eijhhgj/55435095886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455376/normal_6004f907285d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_602da4962cf0f.pdfIn PDF document text
    • http://kevumoler.22web.org/wiwukopuvidutevima.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/iShhjgj/new_mix_craft_2020_world_craft_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_840d0fe08f354e4c9e339026a0902b95.pdf?index=trueIn PDF document text
    • http://zodabozaloti.rf.gd/30938766812.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_a3a5699ff6d84e518c7cadf82298a3e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/26782405404.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_2d06201670354456be82e987f50feae7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/college_student_athlete_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/22721782825.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/37000150580.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/13874111751.pdfIn PDF document text
    • http://nuxizutize.rf.gd/braemar_shipping_services_annual_report.pdfIn PDF document text
    • http://vifotuniso.rf.gd/35143588903.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_28abe71eb4794184bb3ee85eb03a8783.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5572 bytes
SHA-256: 4e801b9b4aab330136afb7970ce88c731e3497ee586f12faf4b0b64c12ed6561
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11196 bytes
SHA-256: 8901975ba59c1bcaec772914d216dab650efdf47024f4cd1d9f224e0ee0c4506