Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abb00cbec34fb39…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 10:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 398b954ac52ab0cdf53ff5607002402b SHA-1: d21f0e66064d435bcd6d2b50b6e37abfe463595f SHA-256: 4abb00cbec34fb391d09dc93a47ff28e04a4e8c80f6d5365a54fcebbc6a838a9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external domains, many of which are likely part of a link farm. A critical heuristic indicates the document instructs the user to disable security software, a common tactic to bypass defenses. While no scripts were explicitly extracted, the presence of PDF-specific exploits and the security bypass instruction suggest an attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://binarbaidtrading.com/public_html/userfiles/file/43115762909.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2782bae3---57058121796.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/xosewedar.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/vimubezuluvibotimupodupiw.pdfIn PDF document text
    • http://metallpress.ru/files/jejeliwiwilanexexebuxumev.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/k3cl52mrj4ubl25vthnvqufktf/lazunorobidonijubisipadov.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/nozizej.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911185718772.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zilesitesatosetixo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613de18895621---47427309312.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/duxumafabufipisijelixuw.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/95516990108.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/putawedopukatesogazis.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/jofupiv.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/82594857769.pdfIn PDF document text
    • http://sciattella.net/images/file/fudopelujot.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/42536726017.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/75705793233.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pelesivenelofikor.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nujodadekiralafubijib.pdfIn PDF document text
    • https://ms02bet.net/contents/files/33883289497.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/73061574431.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/64954778655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=which+is+the+best+app+lock+app+for+androidPDF 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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 10940 bytes
SHA-256: 52d8cc93e8ba2d0447df6856d065f121d87545df30b4d04158f183c22ca068d4
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 17388 bytes
SHA-256: 367a02d0407b431c423b63ef41f0d81361ee639a0abd8f60e97576bcde1b8abd
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1