Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e0a992aee314dc…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 11:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58faaa384e9bd0a8f98c105630714a6c SHA-1: b30a7becf569dcb4564028db528e9e91c2eab19c SHA-256: f1e0a992aee314dce1628aa106c8b555b075cbe2a6d5a249fd8c04ad78f10136
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=cuantos+cent%25C3%25ADmetros+hay+en+metro+cubico PDF link annotation
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/529090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fe78b2818634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_5fd397b34a161.pdfIn PDF document text
    • http://lusivemewuza.22web.org/39220581620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473388/normal_5fdf2daa6c33e.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/taxepabi.pdfIn PDF document text
    • http://mogudovorezuxok.22web.org/excel_formulas_vlookup_hlookup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3644ba49-6b06-4ebf-ac17-961c251c669a/28337880608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/310e2810-8cc1-47d7-958e-dd3e094b3dc6/zivuxitase.pdfIn PDF document text
    • http://gomojopovin.rf.gd/pilat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a5a1c3-700a-461e-962e-d6bcc5bc42c1/what_does_diagnostic_code_p0420_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce262a0f-4a36-4b62-b783-442c4bd01882/29375687672.pdfIn PDF document text
    • http://rozasazi.epizy.com/brother_hl-2270dw_printer_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebc4040-508f-43f5-bfdc-abd33d04af36/gijimojizefokub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86540356-b79a-41a9-84bc-05f64b793cd0/how_to_find_samsung_stove_model_number.pdfIn PDF document text
    • http://kubenusuwixop.rf.gd/vevorumotalilaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77293485-8434-4dd3-ba0c-e13d26f5b1e9/how_to_draw_a_husky_dog_face_step_by_step.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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 5208 bytes
SHA-256: f2f68f21e60d86d1fb5f7c70f9521c92295adad552c20a2677a6ff0168527586
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 12248 bytes
SHA-256: c2d33367ccd0ff07df700c652028d7330a6f52ef10fc85778f36164d31e4ce11

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