Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2e59eacece2915…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 22:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9e48a6026d9ef630e8ac16da775aa0e SHA-1: 9b3ff6f1dccf375930d842b03f124717b64e1a24 SHA-256: fd2e59eacece2915043b0032c85f92c268b4a6282add5a972c02ec6f67683d9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is used to redirect users to potentially malicious websites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=windows+8.1+screenshot+key PDF link annotation
    • http://myflora888.com/ck_files/files/dosevigubipulelesule.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/kilisizu.pdfIn PDF document text
    • https://dm288.com/slicice/file/pagikuvajudetodono.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010812161314.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6a2b37194f63b7ff0176b6eadeb79a80/14423245119.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/zugerifejitelusoteb.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/gaxapuvugef.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kuzud.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/wapubovixefikabakazupu.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/jogujenakolivafujabuzufu.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905213847.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021972132464722.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210909062017_c774j1.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/aa24577ff3d815edcb972d6c24ba9198/44943042944.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/49519114674.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/22320341704.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/65426306017.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/nowuvowugajujujuz.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rewigulabit.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42869348011.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613127e77db8c---75946565905.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/sujafuxaxusojupiguz.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 17940 bytes
SHA-256: 1262168c2b47eb975746157b7a2f59c105766a838f518bdbc3071bf5c210b6ea
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10868 bytes
SHA-256: e951f616413c7ea5c9df15ea7141ceead696c6bd006128091a357c0477cdd4ce

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