Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ef1c4f9b456753…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 03:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d7ab80d406ba0a35cd0b6e5a4a5e543 SHA-1: 3665fe4a7f2592edf96852e71bc936f5bff990eb SHA-256: 54ef1c4f9b45675302728e9dd0eba3b2371b10bd0ddab66567035158f4a83b69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The `wkhtmltopdf` authoring application is noted, but no specific scripts were extracted for further analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=harry+potter+prisoner+of+azkaban+watch+online PDF link annotation
    • http://sm300159.agchost.com/userfiles/files/37726820546.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/wugetu.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/33980188865.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/22370279018.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/k6ivcm5gfr55gs3qshnci59j6r/nenupemawiluzunuxenu.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/65412630984.pdfIn PDF document text
    • http://7profi.net/userfiles/file/27827729232.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613293fd8fbb5---75132438566.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109091124243270.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/33470610950.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/vobarevi.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/1206210057.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021910336516434.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/vinen.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/31276415549.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/58953639147.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/85284161091.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091622283973499.pdfIn PDF document text
    • https://atlantidegattico.it/file/93204119049.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/28947369861.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e21187a23---57885572264.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109070730068363.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/54833334825.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nibofu.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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 19196 bytes
SHA-256: 67e852f77f5418ee286042d29c57a9771c066f38af2b68b66dc6e102805f71bc
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11060 bytes
SHA-256: a4e850fc9c6a1ebd8713aac89e6cb15c842c393b5c0f23090fd95d13f4a2b8bd
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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