Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e4ed854b201bc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 15:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6876996bb22538c04ae43f5217743c07 SHA-1: d7c7b747c70cc1f17325ab512be332405fb0b338 SHA-256: 4e9e4ed854b201bc493b39dfdeec0b1da263098301a5ce1f68fd8b6580fc5879
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vecsecity.info/editor_up/26436597907.pdf In PDF document text
    • http://tuzy.pl/Upload/file/63532458066.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137de0f3aea9---37057472772.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/zaxojoza.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jopiwojetojununapag.pdfIn PDF document text
    • https://angkalaris.com/contents/files/48279311940.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rilupaxinat.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/migabuwebujofured.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/55121886626.pdfIn PDF document text
    • http://lecostationery.com/files/file/kiximatorovugetixepis.pdfIn PDF document text
    • http://888chji.com/userfiles/files/97006341928.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/zomolepesevupux.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/48152358950.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/16900883190.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/40027112743.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/gakalugeti.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/78673348735.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zutijazeboxabi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ed9be39a220dcd66c653bbe37055f55c/jukaraful.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/pesexugitezebuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2011+kia+optima+hybrid+owners+manualPDF 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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 11384 bytes
SHA-256: 822c79c0021561c4560b7fa9a0d9708c89fd87ff72e04e52206331e39916ef6e
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 17344 bytes
SHA-256: d1e492a2ed2b7e2a35893b454cdc75b4d4905bd3601693c3409998859c5953f0
font_02_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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