Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cbe7c2bd739770…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 14:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dfc594a43e605e4ab1cdc12d36e47ae8 SHA-1: 7395cf5d264bec15da8f0a61f762789f98a02f5d SHA-256: a4cbe7c2bd739770784c01dac49a54aaad9fca5d34a7f4329eef9bed9045d09a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, while many are benign, point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://eko-inwest.eu/upload/file/25244403752.pdf In PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/rumejenexozusenufujor.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/84077703251.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/53992845171.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/90527985575.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/talofalejow.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobit.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/78314593202.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139d364c4f67---20275910227.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/90642edc005d47641e3ed88779b39bbb/jotonudozasizoladujafij.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/46063709741.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/55884880158.pdfIn PDF document text
    • http://langmypham.com/luutru/files/61635869247.pdfIn PDF document text
    • http://tabletopad.com/images/file/guzenisofumamorulajuv.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nareditotefopazurowoji.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/tuzoxobopomal.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/jevepofujavimobogupab.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/2568188647.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/43926150685.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/nexitido.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/41103939711.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/ridozerunaxijunobov.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/57216122204.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191101041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=example+send+resume+by+emailPDF 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_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 17108 bytes
SHA-256: 31616904c855654a5b7f3f847d0d78fcbf8a6e266a2a1a8aebf6ca00c077e7f4
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10772 bytes
SHA-256: b2312d4caf294fb4d4d68b873a33c70211b9a9e2ab5376689d251c1dfc80abf8
font_02_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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