Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4a87480e24612f…

MALICIOUS

PDF

90.2 KB Created: 2021-03-19 23:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d27f1eaff7d730650128e5de7ba8bc8 SHA-1: 12ae5aa1b409176be3d8cbefa0622a1f0bf1256f SHA-256: 4a4a87480e24612f0a7ba14150b8b162fcc863a90afdef5f338a8f069e719ec6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=whirlpool+washing+machine+manuals+free PDF link annotation
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/9886848.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/8735026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5fd904b55e94f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fe2d65125716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_600730b1b755a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_6015ca4494084.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/8256650.pdfIn PDF document text
    • https://pixojewunut.weebly.com/uploads/1/3/2/6/132695451/momuzakajigara-samajobib.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/memudifipal-bizarumim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_600da01f75028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/92164106507.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/fodapuxatutewupanosezuve.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/steppin_country_line_dance_step_sheets.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_d6b4a9fd2c214ff2bcf5f90b99661588.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_59c865380d3140fc8f52e26e1d5f4dd5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/simple_business_plan_template_powerpoint.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_2ab56b6dd0cc4dc5bf524d9e1d8d28ed.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_a32e28989d7f465093b4ec5a557bced9.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_0702b0e647bd42a7b2e3774ecd6020dc.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_2550513aa9154a098426d02a9e001c79.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_918a7a4ae5854ae4936d86d890cc78a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/97893598671.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_2acaf8babedc47b49ce4cb7bda40f8cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/28710324833.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/memizigurik.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/kikejiraroxukisexisop.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/28898856436.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 5532 bytes
SHA-256: cfa2ce1c5c260602c971dd311ba423550ebb99a644752f506a970afaefbf5349
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 10884 bytes
SHA-256: b91a68940f503d549fb10a277c41b1626399d365cb787876c4733b2e21bfd631
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 16148 bytes
SHA-256: dbe1f6873dfbc63a557840fa26764ed1e24daf10180a919a5f50e881975b6f06