Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dee0cdb096dcd4…

MALICIOUS

PDF

80.9 KB Created: 2021-03-09 09:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5782ef78d5f09c3f6dca1c7e8a957e73 SHA-1: b0ac1a4c69335edf41abe431692375c20e7510b2 SHA-256: 28dee0cdb096dcd4338dd7314ba2f60a192949f744159d1de5a5c918d7d63281
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL `https://zajinet.ru/award?keyword=ghatna+chakra+book+in+english+pdf+for+uppcs` appears to be part of a SEO spam campaign designed to lure users into downloading further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://zajinet.ru/award?keyword=ghatna+chakra+book+in+english+pdf+for+uppcs PDF link annotation
    • https://cdn.sqhk.co/divoxisig/ibN8igc/68282573534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6032903161631.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/Tjcibic/mods_for_minecraft_ps4_bedrock_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_60184a1110ce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_602ca8752169b.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/ifsidhe/86894805125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d7e71da6c.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/hjiiVgj/biomass_power_plants_model.pdfIn PDF document text
    • https://vudepupebowazuk.weebly.com/uploads/1/3/4/4/134472779/buzuloda.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/f04ihL7/shaolin_kung_fu_training.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_603a7dbaddbc7.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/7212017.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/ErXgfLw/vovedepif.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/3e0d9f0c46d4ce2.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/kopisigapub/lexelososemujevuzusisara.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/lebisageveneweso.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/balesizesiguxudu.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/7090926355.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/99455562914.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/47798472101.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/23130184794.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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 5652 bytes
SHA-256: aeb4e0d36db5d3a62c615775381ec89cff1ad062b3128c62215aa4bdd726540f
font_01_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 10432 bytes
SHA-256: cab4b635ef520b333c9a7cb43c3ef27585dc8aa9146d7e2ddef58dcee5a879e9

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