Malicious PDF — malware analysis report

Static analysis result for SHA-256 3001793109dbf0ec…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 10:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bac678d2f519885be3c18960acfe194 SHA-1: 0feb6cb7e9b243288d8082f587ecea28c8a28a99 SHA-256: 3001793109dbf0ec8e153a832aa2256f19479efbbb63c972a1f365d5752834ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aldobini.it/userfiles/files/33345523762.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/91920255338.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/dezapegaxulumipize.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/libamovenisunikixefi.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/542141027.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/pesukifolo.pdfIn PDF document text
    • https://onlinendttraining.com/files/lifizemigarimulalafaw.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/patuzikinedupinug.pdfIn PDF document text
    • http://frchem.cn/upload/files/jizisadiwila.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/22806952724.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/sirajesojuma.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/51870267145.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/wefese.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/23811744952.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wuxed.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/63506692184.pdfIn PDF document text
    • https://baongochoa.com/upload/file/manoruferiwawow.pdfIn PDF document text
    • http://tipiland.net/upload/file/zajamam.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/55624874741.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132433230308---28073616203.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xoroba.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/semodozufejejej.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/maxipiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=new+youtube+apkPDF 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_off0000b7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 16336 bytes
SHA-256: 3ace85311542a427e36dc2516eae1780b9215d3b78bca0482adeaa1546af38bb
font_02_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10244 bytes
SHA-256: 2aca62c513dfee2da33694706a453953f4e18d50cd333fea49cd1aaa94b76286

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