Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc924768836a492…

MALICIOUS

PDF

81.3 KB Created: 2021-10-05 08:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e593c627e20764315ec64f2b9281951e SHA-1: dc91d749ba1c3f11bda2a46ba3be2f03f984e2c9 SHA-256: adc924768836a49288c21069c914b3d96c950b75ad933e1b93f4a7260b467556
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating an attempt to obscure the final destination and potentially distribute malware or conduct phishing. The file's structure and the presence of many links suggest it's designed to lure users into clicking through to a malicious site.

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353ad3123cb---31166649523.pdf In PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/bufadasir.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/vidifugenimugujebukidutuv.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/puxagul.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/xebepizobojexebuloze.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/43659343417.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/24687701396.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/56579759228.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/badoguxanamuwatob.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/74710864338.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/gamuvoroz.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/basolerip.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/59726129609.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/dizelazijiso.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/15924736522.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/99757210104.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/7715495205.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/13731126472.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/698a7b93d521b8a7dab4b31474b746c7/fedoluvotomomali.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913132005154.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/65322700937.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/48536109325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=electron+affinity+of+halogen+groupPDF 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_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 20332 bytes
SHA-256: 3dce8b2fd21b9963448f7453441e5e79e41184bc1c8fd1f8c8739d071770970b
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10788 bytes
SHA-256: 2fe82202af30012c873d65e94658f0cf582c335941860b49fb754976a7cc55c5

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