Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa6d973e8fe1f2a…

MALICIOUS

PDF

75.4 KB Created: 2021-05-23 13:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6585dafd449558f02207067d3af270f8 SHA-1: 23ed02f203c6f6f5f147cca80968115cd0d47dfc SHA-256: 8aa6d973e8fe1f2abbaa7e183958541b8a3b5bd079eed8be7d57e788d721e4c4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the PDF contains a large number of external links, with the primary suspicious URL being https://dugedepap.ru/strik. This suggests the PDF is part of a link farm or phishing campaign, aiming to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://dugedepap.ru/strik?utm_term=types+of+tracheal+system+in+insects PDF link annotation
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/7c65e.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/1817412.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/76fbd.pdfIn PDF document text
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/biliboginusorisu.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/fukili.pdfIn PDF document text
    • https://miwijefovutifim.weebly.com/uploads/1/3/5/3/135316182/dotawuvixojovogulodo.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/8aa5ea095047659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waduzirader/kufapaniko.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/86077473272.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/71899999323.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/mudumeketijalojesu.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/smartsheet_engage_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/22713447143.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/annual_report_cpn_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/29390963598.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/77358033103.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/sotimolupix.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/avancemos_2_unidad_4_leccion_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564260ec-1b29-4b99-acb9-3311b9bc2246/how_to_replace_toner_cartridge_for_hp_laserjet_pro_400_m401dn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5425df-cc3a-43bf-b2d4-52a23c691336/kisovolazar.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/what_is_twenty_thousand_leagues_under_the_sea_about.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/thoracic_aortic_aneurysm_guidelines_2017.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5308 bytes
SHA-256: 8162054340e9a627582dfa9bb6f9d5302a63df3fc4a1915139cf2825ff6d0f87
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11108 bytes
SHA-256: f1afdb710d8b66b0bd71b8bfd96442a03c622f61735bdc988d87748f3a9ea620

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