Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a93fb0e66aefef…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 05:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd432e467ee5706543f8192ab4509c46 SHA-1: 31746e422b16320e1cdb624772b45fbb54a16029 SHA-256: 87a93fb0e66aefef585f176ad35d27a258474e18991caeea495df637bbd1bbc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm with a high number of distinct external URLs, many hosted on potentially disposable domains, indicating a likely attempt to direct users to malicious content or phishing sites. The PDF structure itself is also suspicious, containing numerous embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=nfc+in+mobiles+means
    • http://lesen-und-schenken.de/userfiles/files/47647797961.pdf
    • http://namkhoabacninh.com/images/files/27038842916.pdf
    • http://hk-keber.de/images/file/47351983015.pdf
    • http://tehla.eu/userfiles/file/somaj.pdf
    • http://ayurvedicclinic.org/userfiles/file/gikiw.pdf
    • http://cantinachitarra.it/userfiles/file/kuxuwasupom.pdf
    • http://kedehg.com/ckfinder/userfiles/files/jidoxamujig.pdf
    • http://czernavendeghaz.hu/admin1/file/vajemaweraxemelosi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uv9pbs27nf3ketvb4t5roikdpp/78755370725.pdf
    • https://cabsfromheathrow.com/userfiles/file/fugogexawasasonaxofufipus.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/58493420844.pdf
    • http://letnipohar.cz/upload/file/lixanataxob.pdf
    • http://profesniprukaz.cz/ckfinder/userfiles/files/seboku.pdf
    • http://htwy.com/upload/file/pemuw.pdf
    • http://obrienbuilders.com/userfiles/file/44483306996.pdf
    • https://cafesca.org/ckfinder/userfiles/files/fixajunigofuzenigile.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/xubefapomosiletetotapaduw.pdf
    • http://architettogherardi.eu/userfiles/files/kixafazo.pdf
    • http://sicilalluminio.it/userfiles/files/67339662346.pdf
    • http://fatamorgana.fr/uploads/assets/file/wobaxon.pdf
    • https://vnmmalta.com/userfiles/file/ladidewabibexuw.pdf
    • http://xn--j1aii.su/userfiles/file/26902906622.pdf
    • http://worshipedia.mobi/sites/default/files/file/48364241667.pdf
    • http://munnartourism.com/uploads/file/sisepijajavetatitu.pdf
    • http://yarpb.ru/pic/userfile/xunukodujogowu.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/gazisaxukabanamozam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d516.bin
673f594808bf406f8a2db0f9d021ca390f7c79574dfd4b8c1b264a00a33db18b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 18940 bytes
font_01_sfnt_off000106a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 16792 bytes
font_02_sfnt_off00011ebe.bin
fc49cf0df8fcc5025dd8190c3b9070910f609ab02558a3a29f0ce099776045e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 10416 bytes

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