Malicious PDF — malware analysis report

Static analysis result for SHA-256 e400161848f194f4…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 06:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df965e832a79978d6fae76a30f15ac40 SHA-1: d2a7678b8ff23ff878a4922fc3fe2704908f607d SHA-256: e400161848f194f42455d841470af16e2fcdca23f2eac23cd1a03ed40ada31f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL distribution suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://watertorens.nl/userfiles/file/17438310584.pdf In PDF document text
    • http://ets-sptk.ru/pic/file/zavewulivimagekidoritu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3r27cqcn32bb9a5eor9sf533n0/fugis.pdfIn PDF document text
    • https://quizai.com/uploads/files/20562865873.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/refobuvixa.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/rofewiludosozowe.pdfIn PDF document text
    • https://susta.vn/userfiles/file/lopevuluzowuvuj.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/guwofibeduk.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/gosomar.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/39845967478.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/pizutodonofadumi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tenewip.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/7859645105.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/sufademutozorefak.pdfIn PDF document text
    • http://gaudi.tw/upload/file/78584484040.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/kodikajilemifujevus.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614364c88d8e8---86316869342.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/64626535275.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/popavetebagewapajusizo.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97986413583.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/3776559806.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_592BCF7BEE804923.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/safumezedivasimalajubus.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/bupepiberefodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=antutu+benchmark+of+poco+m2PDF 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_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 14712 bytes
SHA-256: 549d7a00507aef64b0be8d433b2a496bdd664e2831461e2acfb46c95ae527553
font_01_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10872 bytes
SHA-256: 602dbb6e6e6d35bf0f2f93e1318bffc85c2bdeb9c3693ed4ce46c66a1c16f806
font_02_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1