Malicious PDF — malware analysis report

Static analysis result for SHA-256 369cc720999d931b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 13:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 535811546deda8c5f4633b96b3ba8be1 SHA-1: c2e876316b89e962745d1522393363688988ae36 SHA-256: 369cc720999d931b931738b13c33d790eea48d7981b0f93a38c0d3e745ce74cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=hocus+pocus+live+stream PDF link annotation
    • http://jiji.pgo.tw/pic/uploads/files/60369338518.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zupige.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/82074447458.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/puduziraronuxopojugekuzi.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/bipalorevijari.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fiwamuvovupazedelasiwako.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/xanurigexakaruga.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/97014388199.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/dobedipodisepazuve.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/teburarutezajag.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/43621138752.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161308d93775e8---rajesimoredopelonu.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/45311928304.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/bizugavanewubuzupeju.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/72182536951.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/83121213320.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/seruramoxuvi.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/fogotapimevigatibis.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/33335137804.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26953679867.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/96322880165.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/64384990037.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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 17476 bytes
SHA-256: 36e5e723ef92ab56f6c6ebbbd67a5e07ded97fb606a170ca532d616e14b3ec30
font_01_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 10588 bytes
SHA-256: 20eda8df56dd97a1638d2ca2bffa949d3d9dafccf86d398c63c768b6c4ebe170

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