Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfcf2e15497304c…

MALICIOUS

PDF

140.7 KB Created: 2021-02-13 19:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4763f7c4f99eb0cd88a86aeef332fcf2 SHA-1: 057a379f0bb25ffb4c835b7475e74654afecc8f0 SHA-256: dbfcf2e15497304c2b40630c2a31fb833d5b8b4f26362aebb201f667d6b05a42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various domains, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attack pattern involving redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/123?utm_term=plan+y+programa+de+estudios+2011+cuarto+grado PDF link annotation
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/modasikufavav_jagoki.pdfIn PDF document text
    • http://sigixez.22web.org/ignition_mobile_module.pdfIn PDF document text
    • http://ulekschool.online/bakabezijijijudazeb9zxjo.pdfIn PDF document text
    • https://faxitovi.weebly.com/uploads/1/3/4/3/134379512/6441495.pdfIn PDF document text
    • http://regsenatvumen.website/web_page_maker_32_bit_free_downloadf31t5.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/nidewig.pdfIn PDF document text
    • http://karnaval.host/9445371594l1eov.pdfIn PDF document text
    • http://igme.site/guns_of_glory_alliance_teleport_not_workingt57pe.pdfIn PDF document text
    • http://probnik1313.tech/solunopajegelkr.pdfIn PDF document text
    • http://static-get.top/1_minute_10_second_timervs1bk.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/bofum.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/geraromu/96954529443.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/8732450060.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/87589876630.pdfIn PDF document text
    • http://fuvezijejek.epizy.com/active_directory_windows_7_32_bit.pdfIn PDF document text
    • http://bekogufepe.rf.gd/celcus_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/wodonetorezupuvadiwewilu.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/hydrobromic_acid_msds.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/puwelubamagetepomo.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/formato_libri_kindle_paperwhite.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/song_editor_app_android.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_off0001e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6AC 5820 bytes
SHA-256: e4ceed646571ec44357ea333587c77c1d64304a219c547df47d24999d3143178
font_01_sfnt_off0001fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA7D 12372 bytes
SHA-256: f3f7f346865bf7bfe920a7861534d421ff35e11ea135a5aae5f90fffde6063c9

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