Malicious PDF — malware analysis report

Static analysis result for SHA-256 837b735ccd6843a9…

MALICIOUS

PDF

73.8 KB Created: 2021-03-12 09:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c6d289d0d96c9fb793364b96b9e71b50 SHA-1: 3c03af58127c5f432ddf83fe3dcf719a9e2be2d4 SHA-256: 837b735ccd6843a979b5c583164edef97b19d8a8fe98a867189e966c01a8cc33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://pelibifir.ru/123?utm_term=hybrid+renewable+energy+systems+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4504922/normal_5fef6f5135ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_60288320246d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_6042d18831c50.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/powawegoguzor.pdfIn PDF document text
    • http://jalatuxu.iblogger.org/43355855670.pdfIn PDF document text
    • http://darusupula.22web.org/the_passage_justin_cronin_movie.pdfIn PDF document text
    • http://kevumoler.22web.org/rizafolowifefelumiposov.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/91692753565.pdfIn PDF document text
    • http://litamomun.22web.org/1034318326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozidimimu.rf.gd/bawivov.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_cec9f77130d340f7b376ace1d991af1b.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_58bc4c3ed5bf41bdb7ff4563b22df32d.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_c23e5f6e6eb346448ccc90f7c6c0b618.pdf?index=trueIn PDF document text
    • http://sanebofav.epizy.com/xamoradozebijuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/tomb_of_sargeras_raid_guide.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_032149b3bc3a47b487e9e97613ed0954.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_627959630c1a4fd4b4e1d3680ca65c47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/56337880619.pdfIn PDF document text
    • http://jirozeb.epizy.com/flathead_lake_fly_fishing_report.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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 5656 bytes
SHA-256: 809132c427c8dd5fb8478a0dd95c1c4392ed6d794e418f9f6173cb516df6d873
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10288 bytes
SHA-256: 6117b8bd3d15cf784469b256fef2deace94cbbb49caaf1ec5e7aac0af43e6a4d

Open this report in the interactive analyzer, or submit your own file for analysis.