Malicious PDF — malware analysis report

Static analysis result for SHA-256 821d31cdefbf7d78…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 18:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a0a05bf6e0202783249b8ed870aab7b0 SHA-1: b86f8160cd869de3f11250e071933ea5126b735b SHA-256: 821d31cdefbf7d78ce50e0410fddd8179deeefa3593340864a4e1127c1dd54ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that redirect to external sites, characteristic of a link farm used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the document's primary purpose is to lure users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ketchas.ru/uplcv?utm_term=the+meaning+of+oblige PDF link annotation
    • https://hrmconsulting.biz/upload/files/gekuzupu.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091908465670554.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/69127390790.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/81796670768.pdfIn PDF document text
    • http://ausietech.com/images/file/12881355320.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/71580491546.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pemigokiwinenosu.pdfIn PDF document text
    • https://salwangurugram.com/files/42145894973.pdfIn PDF document text
    • http://inercial.es/uploads/files/zibazupinir.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/44245478075.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/kirajuxit.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/berejegozuruz.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/32525834112.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/zaximu.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/galoxobutidimesi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913221716465.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/93578876972.pdfIn PDF document text
    • https://2winit.com/Files/files/50591390543.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j2pti30l9itg74jv9mem7lgpls/29831032935.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021971244156006.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/26137992148.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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 17420 bytes
SHA-256: 98829c64e5614d73b52f2fdcb7803892cf1b71782a46cd4286b3852938708ada
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 10400 bytes
SHA-256: 3669203bc68a94fad791846aa95bc14d5331e244e19af6f36d069dc6d29d0fec
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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