Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bf71b3457a4ea5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 11:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 189e059c44dbd8f9eae8cbff625ebf84 SHA-1: 58414a67ae6ce0bdbe40f739cad0b26587becc6c SHA-256: 30bf71b3457a4ea581dca7d9a1513978dc26f5725156f5564f66d29cc945d06f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and external links point towards an attack pattern involving directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fundacjaartfreeart.pl/userfiles/file/66337586090.pdf In PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/ditigitajosowometub.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/sosej.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/92619872686.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/10572318550.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofuxonawipepovolu.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/57459222257.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/ximaxapojutafatodete.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139fab23bdb4---79552988659.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/zelatadexejinenaluxavis.pdfIn PDF document text
    • https://ijp2.com/contents/files/vibawirel.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161399216cf520---xexewujizebawetoku.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/52412253409.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210911145050.pdfIn PDF document text
    • http://hotstamping.pl/files/file/15548311507.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sexegudagokodotarulagize.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/56216909134.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/sofofuzukigotoxodotub.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/konanevotejexitofamemopa.pdfIn PDF document text
    • https://totounited.com/contents/files/titazudusej.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/sebaniwetetatudexifapun.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/rewiwudoses.pdfIn PDF document text
    • http://sartor.ru/upload/files/kagijebeworutoxubor.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/tosoxasopixuxeboxafununov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=caps+for+sale+pdf+freePDF 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 18768 bytes
SHA-256: 1301cd0f97df463fbdbf1348346070b9f7868d928ad3f3a8c178f4f55cc6ca00
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 10228 bytes
SHA-256: 6a981239bc0ec8634b40721d5ee9d50f21381c488ea06999e31d59f16170e615