Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d55eb8147c698d6…

MALICIOUS

PDF

74.1 KB Created: 2021-10-02 16:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43f9afe8a68c94c852d1098946563d47 SHA-1: cdca60ca52889b8abe559efc8e1aa1ead0e5b99c SHA-256: 7d55eb8147c698d607e1b3310f2299036a337ff3c5ffb37eab4f6ecdfb265054
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many of which are part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=64.2+kg+to+pounds PDF link annotation
    • https://oolong-dining-co.com/webroot/editor-uploads/files/morupamezofefitav.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/93291681813.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/tewitafawatifagamen.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/44792275302.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/jugiserunidedamat.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/dajujitazun.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/goporevam.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/6985865711.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/35549420546.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/pizogipolafukupob.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/luwogebetobubexuvur.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/63050533414.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/52272853609.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/25010998571.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4a3ce7bef81d494918a288f19fbafc57/90421007409.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/67927677360.pdfIn PDF document text
    • https://iwistw.com/upload/files/49737992451.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/xiretawomiluxolapisare.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/38956875882.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/10029020877.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11648242257.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f44fba60832f45eaf475b01c7fa6fdef/vobodozejekanetefabi.pdfIn PDF document text
    • http://podushka.by/files/files/82458849613.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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10560 bytes
SHA-256: c327466a3f6546803e06da8af5ede6a52935b42a1cfe4a2bd4475e65ad2f982c
font_02_sfnt_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 18476 bytes
SHA-256: be2c42972a9368be7bcfaa28a54a86c6ba64aa1354c96ee116348f9b854ac61e

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