Malicious PDF — malware analysis report

Static analysis result for SHA-256 421c554b26ea20e3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 16:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 039b9b387a958daa8c42dc1b8075904c SHA-1: b7d8ee2f07548743feb20b10a8a72e09d0fdde95 SHA-256: 421c554b26ea20e396bc494035e1e5b952bf52081776a1038f389c11e7af9181
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://madhubanindiancuisine.com/nbloom/fckuploads/file/dufufabeponepezotipupudu.pdf In PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/ketavopawuw.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/zenuw.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/82959760359.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16612887874.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/11920819200.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/90857734257.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/dajebuvo.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/50007156540.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/3341904524.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/96412370394.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/47452301764.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zobuz.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gepavo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/nigetakifud.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gireximavunud.pdfIn PDF document text
    • https://atiksigorta.com/files/butirusirogogozogeja.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfacddd68---64697058056.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gofipotulotomezajefe.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/74600782465.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/53089287760.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/47426281092.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/34572366918.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/zudijari.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/43607837983.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/tuvovimu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/33055226659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=oreo+tv+cricket+livePDF link annotation
    • 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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 9972 bytes
SHA-256: 8feeafd65cb4b663dedb43a401d1c88168f201bcbc6f23ebfd0304822d25fba8
font_01_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 18500 bytes
SHA-256: a37188b4ffd22cb4cc02745a26705feefe401a7e22031e914d27af2d873eadd1
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1