Malicious PDF — malware analysis report

Static analysis result for SHA-256 585e5b01a7932362…

MALICIOUS

PDF

83.2 KB Created: 2021-03-14 04:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 58afb9234c8202ed02209afafb4ba9ca SHA-1: c01554d274ea7aa2b4a7e1d64a5fcc1f6e560e68 SHA-256: 585e5b01a79323625ff00d9ebb2de1323b224280273907a6533f7e455e2fcb27
126 Risk Score

Malware Insights

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

The file is a PDF that contains multiple embedded URLs, one of which, 'https://resalured.ru/award?keyword=alumni+speech+pdf', is flagged as a potential external URI. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a malicious intent to redirect users. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely a phishing lure or a downloader for further malicious content.

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://resalured.ru/award?keyword=alumni+speech+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409997/normal_5fe49da380045.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/65746909001.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/brene_brown_definition_of_vulnerability_dare_to_lead.pdfIn PDF document text
    • http://buzofenag.22web.org/4099238082.pdfIn PDF document text
    • http://fajiwegoj.getenjoyment.net/cisco_structured_cabling.pdfIn PDF document text
    • http://famesodelazij.22web.org/rorixixamupejepo.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/denon_avr_2312ci_firmware_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_60300fe046b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_604d5fe6cb301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomagupivedib.epizy.com/18213758510.pdfIn PDF document text
    • http://powosegunivu.epizy.com/top_chm_reader_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc96ba9-7696-465a-8522-2858424641d5/29512213816.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/55291930387.pdfIn PDF document text
    • http://ximitexus.epizy.com/62176115893.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/do_all_oral_b_brush_heads_fit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b96768-4392-4bf0-b15f-a660867312ff/97171908959.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/html_login_template_github.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/christmas_letter_templates_free_printable.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 5080 bytes
SHA-256: ce25cf534cd0f632467f6dc15fca09b71e6bf8cc20b8fecf9ba1e9784bf639f7
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10900 bytes
SHA-256: c0d6edb1e53ef4d4a4c09b52b966ec14a4ac0cc66307948f3c2b5a1207a46ec9
font_02_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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