Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa6b6ef213c62da…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 05:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 05f13e94fcc04486c957b61ed9d47230 SHA-1: ad2cda5b2c17fda95e43d28308dccf284428ea10 SHA-256: 9fa6b6ef213c62dad8e19e32edf2dc10aa7b034b7b66d3e11274ad6350a5c0c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://chulintemple.house-well.com/CKEdit/upload/files/netojopitakuwuve.pdf In PDF document text
    • http://sicilalluminio.it/userfiles/files/senirowizulovoveveb.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/webujawawujuzarepitika.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/78979119021.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/20246170050.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/lijovuwugefobikejetixo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jobewamowugopubaridaz.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/93854952959.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/nomogif.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tagowaxiru.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gadosizal.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/14703644058.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uh0d183hgdjtvs1k9vj65skt2q/mewedupajasa.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/bazaf.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/61393579746.pdfIn PDF document text
    • http://clickvay.com/upload/files/kiduzo.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/57685922782.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/42715648584.pdfIn PDF document text
    • https://dalba.net/other_files/File/99172651775.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/1840328002.pdfIn PDF document text
    • http://didopack.com/files/33398154970.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/loxenusenulojizif.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/92018610626.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/gudifoxiterev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+secret+life+of+walter+mitty+pdfPDF 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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 18952 bytes
SHA-256: 9a63699245fbd397d83118df441f6fb8457fa682f715cd831372a3ce14755414
font_01_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 10944 bytes
SHA-256: 7fc9fedb93c9404f864dff08f96b269adc4c527891f0d01b0c0b8c8a720eae1f

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