Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde09938884549ae…

MALICIOUS

PDF

91.1 KB Created: 2021-05-05 03:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ba70624a2e956955cf9b0d3d565c464d SHA-1: 5aa7d5a75b8922a4d815a031efa61c2dbd811f64 SHA-256: bde09938884549ae3c5db3788baa8dedb831a89ab114820164f802000783e6b8
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 0.9981

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://jottigo.ru/strik?utm_term=sadlier+vocabulary+workshop+level+f+answers+unit+6+completing+the+sentence PDF link annotation
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/vojazusirizotirubo.pdfIn PDF document text
    • http://lightly.store/80040523862yx055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fc86fd7d3051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_60257bded9397.pdfIn PDF document text
    • http://devlp.design/1619821455qcm7q.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/daxekuma_jisegoxubara_selewonod.pdfIn PDF document text
    • http://mexicotop.xyz/cartas_a_una_joven_psicologa_deshgppd.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/rexopamedajezekages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_602813b08d245.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/5419139.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_71f4ecafedeb4ed5846c9c093454df31.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_8d1308087e504301af2ecc29d9ecfd8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/55361391330.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_f11a1d6630734e15b3ea6d65c220f2e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebokizez/juvonukidip.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/34858708924.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/vipasesexajipavipese.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/piwowa.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_e4b9c7e85ffc49c893310c6b097b4237.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzakob/3640580479.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_694bfd5f667440acbeac992b88ea8fbc.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 6284 bytes
SHA-256: b065b26f96201f2488d8cc58f3162ea22d52fbb1874fce37115ee7a3969c7521
font_02_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 8364 bytes
SHA-256: 624b108c29625e690bf2103de3ec42f468a139f406b4538c40b1c300045673ad
font_03_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 10924 bytes
SHA-256: e198025037434ea7b203612daf029cca572a4652d13cd3403960a5358df0a837
font_04_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 16604 bytes
SHA-256: 1c95e2234e51bbdaf564a248d7618f7f87e960f13d17883776e03b67f7aa0697
font_05_sfnt_off000154ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 1740 bytes
SHA-256: c3083234ffb6d861bab5d39791d58a5de51bcb1f3d85f264bb0581569c330447