Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a5b92ee0b844b4…

MALICIOUS

PDF

84.6 KB Created: 2021-10-05 08:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05866b31b0747fbff82d16424e65cd11 SHA-1: c5bd7566fb32ee0edefbb6565a79eb27443d9abe SHA-256: c9a5b92ee0b844b4aa9bcceb2c0db78c828cb203c630c814c59e0db7d6867870
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://zsdbiopharm.com/upload/files/papusosexedutiperida.pdf In PDF document text
    • https://weekendtripskolkata.com/userfiles/file/66343519091.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/duzufaxajerapote.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zomov.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/rinekexulozugixuk.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/xapeb.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/58399368870.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/heb77a1gnocpd0i6t4lstgdc30/14139512427.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/nilako.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/56508160024.pdfIn PDF document text
    • http://usagimatur.com/files/others/senijogerubojuzo.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/tugametadutip.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27462346917.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/27239294067.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/73645883030.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/80718008001.pdfIn PDF document text
    • https://preciseenergygroup.com/media/38777879192.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ba6df00c8---66829353980.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/ginelezos.pdfIn PDF document text
    • https://arranridingclub.com/fwd_docs/file/9070322931.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/77486414050.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/48013093062.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/38993928534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+choose+glasses+shapePDF 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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 19316 bytes
SHA-256: 4f3100b12850436300879c24f1bfaf537130e5ab947e6b5db6a16424304b11eb
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 10436 bytes
SHA-256: b3717c86bf12a44a314f620f574e11926c11c219a2131adbef0e4ae58f263800
font_02_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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