Malicious PDF — malware analysis report

Static analysis result for SHA-256 54abff6c0ac872d7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 01:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12d42d2c7e8d0db65ca34f6ea0f7fb0b SHA-1: eeb5d1063d3b96e0f968d658ceb27222eeb94e45 SHA-256: 54abff6c0ac872d7580e3ad31483dc8004dac8073d13ae0d2a880e92365c67ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The PDF structure and embedded URIs suggest an attempt to obfuscate the malicious destinations and potentially deliver further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=react+vertical+divider PDF link annotation
    • http://hotelclinton.it/userfiles/files/53041504146.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rigeluditudaxodi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fce092ba54bb0ff2e126c92cb2893691/vupil.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wepof.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/roluponosoperize.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/1612973834.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/rogozinawasugavula.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/67638345478.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/bubabed.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/27037705865.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/juremugiwujotilonuv.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/49479299735.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/1519895659.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/wogopiwofizijafakexejizik.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/31166816485.pdfIn PDF document text
    • https://e-room.co/userfiles/file/xilesabedakusiwa.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/28409451607.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/kokizonis.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/dokesubad.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136399ba7715---tarurenebora.pdfIn PDF document text
    • http://holzbau-napetschnig.at/58594138382.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/46804172776.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/3792359094.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/pabefokagetibirizijus.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_off0000c5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D1 17108 bytes
SHA-256: a947993e0824abc9ff8e1b50d263a5be7d57d5ccc939e447023b417e72a08a48
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10084 bytes
SHA-256: 89ed9fc67a33167aecaf2c516f456c1999d0454a672ed9ead6bf8160af7107d5