Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58d9bec9d02c7bc…

MALICIOUS

PDF

81.1 KB Created: 2021-03-24 18:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 012894177501f7381b85f36353809646 SHA-1: 2438d845d344272c2b895202e220691c8a1d88f4 SHA-256: e58d9bec9d02c7bc9aa16ea92811330ea2a24fa7e514c9e8f989c35618fb060a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, characteristic of a link farm designed to improve search engine rankings for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to further malicious content or download payloads.

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://seumenha.ru/award?keyword=application+for+employment+letter+pdf PDF link annotation
    • https://fafapiponuge.weebly.com/uploads/1/3/4/6/134692005/15d4aef3e4b.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/9278f392fbb3.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/xafevale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_6000c5a51f41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_6031ea3765457.pdfIn PDF document text
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/lodenuzunenemase.pdfIn PDF document text
    • http://konolux.medianewsonline.com/braun_coffee_maker_error_code_eo1.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/structure_of_dengue_virus.pdfIn PDF document text
    • https://buxufuniwa.weebly.com/uploads/1/3/4/7/134717035/26e666c367.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/learn_english_app_for_windows_windows_10_free_download.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/paradoxical_sajid.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/tigewibejageju/ninidubisiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/dubisanig.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/totigira.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/logitech_x-540_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/how_to_say_please_in_french_formally.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/resexupijozufopemuw.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/how_to_run_a_successful_recording_studio_business.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/2017_ford_mustang_gt_for_sale_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/58993257605.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/why_is_my_fitbit_band_coming_off.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_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 5212 bytes
SHA-256: ef42a714fd7253fac8f9b97f92a40148c17ec1dd78db02d3c014d0cd20ce9595
font_01_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 10084 bytes
SHA-256: df90e3e34be058e13feb57ff907db98116e07c17a7bac29fbc1eb80c79d39995

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