Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef313f4a8e5794e6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eab560f0bf98d58ebb0a68d50751e544 SHA-1: 1b5174ca68778abd091027f45120beb10b4385ca SHA-256: ef313f4a8e5794e6fe808d340a0cdc88b6818cce6d4e7223b4b1751691e8047a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=avatar+full+movie+123movies PDF link annotation
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/86389923403.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/xujajugavamejemizulimur.pdfIn PDF document text
    • http://zxsolar.com/d/files/23007372493.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/34099455148.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/betujiwoxitaturizulusuzim.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/ximupugoril.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/99082791837.pdfIn PDF document text
    • https://proxus.nl/file/lozizivaguwububivubefu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138543ae45fc---41702164787.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gazabamerowovel.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/72065243257.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/48255396644.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/67648248967.pdfIn PDF document text
    • https://coil.hk/upload/files/19441116098.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/11973308542.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26308101602.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/52770217519.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/96942033648.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/kaduzevuvor.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/kezofi.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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 19304 bytes
SHA-256: dcc7b494bfa36d36f4bd31b022bf04ab507ca5ca9fbe6e68fe219a42dd07e1f5
font_01_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 10764 bytes
SHA-256: 39acd13b7e08f64bca3e2310b0b45648dd5ccc876b08ba0f834d70d556f42eb4
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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