Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0b0eae1e90f920…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 08:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0752b6dc4fbbee97b19e9ad263cc9ad0 SHA-1: ba67c83d5a9409abc8bb8591469ec41abb6f4752 SHA-256: ab0b0eae1e90f920a95439e70b8cda19cbe17784bbd4964ee0c3717b540e6748
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a social engineering attempt to trick the user into initiating a phone call. No scripts were extracted, but the PDF structure itself is likely used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lionkingbali.com/uploads/file/88875661695.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/sisaxugobanori.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/73939794241.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/90915929593.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/55373804061.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/mawapopikowurukebuvopi.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/92513241580.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/13095818392.pdfIn PDF document text
    • https://wildnaturetravel.com/File/57506029289.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/sisifatubipamuv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54e08fa2fdb3d217666177ab16f2049d/77896586936.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mewudimaliribojelabe.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/fagefefujasaminusadalix.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/85200051181.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/jalexokusawan.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/gopetazurefezo.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/66348876962.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/depokipagobuxumu.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/50695251674.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/lozatomadi.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/45618779501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rabies+meaning+in+tamilPDF 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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 15724 bytes
SHA-256: 89ecd0e283a83648e32316add193a5bd83007f3e868df1ce952953f56adc4ad4
font_01_sfnt_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10416 bytes
SHA-256: 9978eeb0644612aa7e324961e2181539a2c00e0f587d1e8d8c88eb4cce70ee88

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