Malicious PDF — malware analysis report

Static analysis result for SHA-256 e133636393b6959d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 13:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4417a97e5f01de1ecedc744fb489488b SHA-1: fcf6134b44cbc780de62dc74226ea579ac1fd076 SHA-256: e133636393b6959deb4628310d62eb6bb302dc7d77024ba78062e9c729d65757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=og+account+fortnite+free+ps4 PDF link annotation
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210907_5D3E66EBFFE6CE85.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce42658c7---96208073318.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zuviz.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/81822263805.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/40492181066.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/84926801560.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/61044601432.pdfIn PDF document text
    • https://ms1oke.com/contents/files/tixagadumu.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/kasudekakuxefabovidur.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/69668685454.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/97659268293.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/27287348309.pdfIn PDF document text
    • http://esen.life/userfiles/file/48998454933.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b822001473473d7c0b82870d9cc203c/9338855879.pdfIn PDF document text
    • http://falerisztika.hu/tmp/famizerisonivalu.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/24810277335.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210921101023.pdfIn PDF document text
    • http://orenprom.com/img/account/file/95218781320.pdfIn PDF document text
    • https://masihpt1.com/contents/files/58241772631.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630973252/files/64060021316.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/zokilusonapo.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gumejabo.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_off0000ab6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6D 16020 bytes
SHA-256: 36c44e1ac2a05e518125ad04c62ffa6737dee71dbf9490d75498d36199a73959
font_01_sfnt_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10812 bytes
SHA-256: 2a68865ec280994d923c5bfd91c83a59a3a932cb8bc8bcccea7b2be982689f3c
font_02_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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