Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce833062b59e17f4…

MALICIOUS

PDF

85.7 KB Created: 2021-06-04 23:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a62e6cf52eb426893045faccda9b0af SHA-1: cea2d80d45b469cf9b7cd39f34d8796df2de9b87 SHA-256: ce833062b59e17f4445bea99e6eb33de4618cd7c2b846eb054342a81c473689e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being https://midufefew.ru/123?utm_term=blood+cancer+report+image. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked documents. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=blood+cancer+report+image
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/46adbe73.pdf
    • https://dunudodijozu.weebly.com/uploads/1/3/0/8/130813966/b35199.pdf
    • https://giwisosolu.weebly.com/uploads/1/3/4/7/134752077/2d4e1.pdf
    • https://radiduma.weebly.com/uploads/1/3/4/3/134362755/9151d0c8530a4.pdf
    • https://waronovubuwige.weebly.com/uploads/1/3/4/6/134631102/6426434.pdf
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/xozafow-nirovirajaw.pdf
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/afa92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pusavivo.pbworks.com/f/donesipowujunotajin.pdf
    • https://uploads.strikinglycdn.com/files/ae38aa94-8cf7-418e-8203-af81c25cedad/what_causes_decreased_bowel_movements.pdf
    • https://uploads.strikinglycdn.com/files/cf49fe50-d90a-49f6-a028-ad999bb7a929/spt_humidifier_filter_reset.pdf
    • https://uploads.strikinglycdn.com/files/95f2c978-65ed-41cb-b86c-585770330c22/restful_web_services_example_in_java_using_intellij_step_by_step.pdf
    • http://zuvuzut.pbworks.com/w/file/fetch/144547374/1000_most_common_phrasal_verbs_in_english.pdf
    • https://uploads.strikinglycdn.com/files/88c45c69-e139-4c95-a95f-7d9866f4de10/vugififerelekobidawen.pdf
    • http://vejivab.pbworks.com/f/jojuzijunevokirokonoxato.pdf
    • http://kedetuwi.pbworks.com/f/68949923709.pdf
    • https://uploads.strikinglycdn.com/files/66414cca-a99a-4e73-9d6d-94fc63eed6a3/grohe_bridgeford_kitchen_faucet_installation_instructions.pdf
    • http://gorixose.pbworks.com/w/file/fetch/144615570/playmobil_victorian_mansion_5300_dimensions.pdf
    • http://gediripu.pbworks.com/f/suros.pdf
    • https://uploads.strikinglycdn.com/files/9ac035c7-fd42-428f-b2c0-0c8e3a05ba6e/basic_business_math_word_problems.pdf
    • http://jagimikat.pbworks.com/w/file/fetch/144598473/refuriximedezilisi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e6.bin
349502603315e2fa2104fba309f3afb9f0197bd91e3871412d7c32523570cb18
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 5052 bytes
font_01_sfnt_off000115f3.bin
26484e32c6446fa6595774c8c29b8d544bac7b20cd4fb42fbc3a1d5c909f9cff
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 11136 bytes
font_02_sfnt_off00013b32.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 4324 bytes