Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c17dbbaab28e19…

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 18:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: daf99f89721ebce143da28d425f03de8 SHA-1: ead8fe385f71c71d8bfa552653e29545cab01221 SHA-256: 19c17dbbaab28e19edf9dfa4018f11f50f2530d0a3d780083a93b12c93f17692
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://pelibifir.ru/award?keyword=job+application+writing+sample+pdf PDF link annotation
    • http://businesslinecenter.com/29923145955ua5f4.pdfIn PDF document text
    • https://kodetowunim.weebly.com/uploads/1/3/4/7/134701578/8971edb29178c4c.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/tefur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_60547787a28d7.pdfIn PDF document text
    • http://gigedela.iblogger.org/android_ios_market_share_us.pdfIn PDF document text
    • http://wamuvosuvebupa.iblogger.org/3391076535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_603a866735c57.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/siwitorud.pdfIn PDF document text
    • http://rirarojafetojep.iblogger.org/dozuropabef.pdfIn PDF document text
    • http://mrshadow.net/fulusenakevazololebamogiw65n8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_602c04b1efebf.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/intermatic_timer_st01_not_workingsvqgq.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/tufitijinexu/flash_gordon_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/favagofezujinij.pdfIn PDF document text
    • http://borobosen.rf.gd/lovalidiniguzasure.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/korumudadi.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/building_construction_layout_procedures.pdfIn PDF document text
    • http://sudewepizetego.epizy.com/bluebeard_s_bride.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 5696 bytes
SHA-256: 288117f7caaaad278f6ff604b7cf0d911fb0f5281634b930b23fee5d4bb8d124
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 10360 bytes
SHA-256: 33714304850c5762aff5a78493aeb1f4792bd9a4a0d9a6c1a79c3d57c7594eac

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