Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0a6bbda361e0b2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 14:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00ebe84b4cf7f796df76d35e44ad662e SHA-1: 2f66480c6f97e1ec3f36152b41bf1a8eabf0e147 SHA-256: 6a0a6bbda361e0b2b5805a8dbcac2b198bfb175ceed4217c09a2b1d33bc965f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=giovanni%27s+room+pdf+download PDF link annotation
    • http://lagerunda.it/public/upload/file/9951689568.pdfIn PDF document text
    • https://digireg.org/upload/88669338646.pdfIn PDF document text
    • https://pecintajp.com/contents/files/jowugazirigodo.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/44023085580.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/jujafodes.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e1f6d664---97341156083.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/356342713.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nexemaziw.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/92499146894.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3ae91blcuslikp44g9rl7gopq6/16277709875.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/kovenotubodojelalu.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/76434907127.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bimopax.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67076484444.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/midoxubekenosugawiruro.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/suguzalagexa.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lixatimabefapanasita.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/66786361386.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/tipawawada.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090408534356149.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/37821927396.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/dinib.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905183359.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_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 10652 bytes
SHA-256: 6b781f7b1d2e7660b48e0a69f11bd6981380930da80ecd172787b32bc2ec0e8e
font_01_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 19112 bytes
SHA-256: efb11165643e7639c18212e3f8fca7c04916f05c19eac67eb48e7e76613f334e
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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