Malicious PDF — malware analysis report

Static analysis result for SHA-256 915023a4539f44d9…

MALICIOUS

PDF

72.2 KB Created: 2021-03-19 04:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d19c01ab69b7a712f744bdeafb8ed01 SHA-1: 104bd496d37a880adeb6c98b05d4f5272ed57c93 SHA-256: 915023a4539f44d92be37eab3be122a474148294a1988ba723aff6e0ff8c7d80
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 0.9998

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://jottigo.ru/award?keyword=boundary+layer+meteorology+stull+pdf PDF link annotation
    • http://dininoxumab.22web.org/57741859919.pdfIn PDF document text
    • http://inglassrus.ru/bapiseviyid6.pdfIn PDF document text
    • http://daliadiago.com/358053248113bibl.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/dadapo.pdfIn PDF document text
    • http://apparentlyopt.com/xbox_360_controller_wireless_adapter_for_windows_10anp4g.pdfIn PDF document text
    • http://thehensleys.org/final_fighter_modvcwsf.pdfIn PDF document text
    • http://biomanua.website/31689131757ln0ay.pdfIn PDF document text
    • http://rusherx.studio/903022474640hfjj.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/ede0280eb228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_5a37e588ad7e4c61bd1bd291d6ec21be.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_f989a3f61fea419db0e9b4b7df6aa0ca.pdf?index=trueIn PDF document text
    • http://kofilufonoxejas.rf.gd/history_of_athletics_track_and_field.pdfIn PDF document text
    • http://ladinuronabo.epizy.com/install_ezx_ezdrummer_2.pdfIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_b27ee4035bce49deb4fbe9bbdd1e7706.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_92eb9d41c9c84f68ad826cb2675b39eb.pdf?index=trueIn PDF document text
    • http://kiwopej.rf.gd/canon_mx430_not_responding.pdfIn PDF document text
    • http://toxezapa.rf.gd/nuxabibob.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_99c6e0d0532d422f8b42be9de4b30183.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_e2bcd7bdc1d1492f83b0b41ae430c337.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_7bcf86317b40426182e4d60313bf9fda.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 5512 bytes
SHA-256: 69583a9119c1368943172823469a5324335873ccd7ea1bea0c2403682cfbdfab
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 11080 bytes
SHA-256: 266eaf785c63c08fa6ede38e09b0fa671df7ff0e3aa4a05e3cf16b1c917f812b

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