Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e64cafe7b734f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 18:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aac4a2414b122a019dcfb1b43c1d4aef SHA-1: 5497f151b0682118cebe670feac9888540ec7c09 SHA-256: 1a1e64cafe7b734fe4006473e8d92c706c6bf654457b1c39983754d6b75f35b9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=lightroom+cc+app+free+download+for+pc PDF link annotation
    • http://detskaoptika.cz/ckfinder/userfiles/files/53719326816.pdfIn PDF document text
    • https://dhesient.com/media/87283279340.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210908142245250451w3s7j.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/89736193112.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vutoxos.pdfIn PDF document text
    • http://citra.cl/userfiles/file/rorexufusiwonipuda.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/fotuzatoropekosofad.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_1581A631861E1D93.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328a53c02fd---55836006420.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/84546867413.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/xudededepepazogepuv.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/rikerudedokosob.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/lakolufulazepadiji.pdfIn PDF document text
    • http://hmed.vn/upload/files/rixepup.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/devemu.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/19029074713.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613226f73cc78---15039304140.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/78381161097.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sakoko.pdfIn PDF document text
    • https://doitoutdoorz.com/file/LWbbpwat3OlznBhA.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/25669753912.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/sasod.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/62889926188.pdfIn PDF document text
    • http://chayka-svg.ru/files/lujilowizedupelal.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://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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 14408 bytes
SHA-256: 894e90586b6e67876090dac9db9fc587e8a89828bfbee8bfd1d139f034c37e9a
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 10940 bytes
SHA-256: fb597a642ebea64989d9ae272254a231d8b55f14e8d07d026ed57b2bd224cbe5

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