Malicious PDF — malware analysis report

Static analysis result for SHA-256 763b2faea2a570ff…

MALICIOUS

PDF

67.1 KB Created: 2021-03-05 16:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d871518174c97ba59f3653cc4fd2e331 SHA-1: ca677b8e06c3921e1dca59640adf652371307e36 SHA-256: 763b2faea2a570ffdd969089a2bf6163c1e1c5e4369cfd6f3857ce34c18637da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/aws?utm_term=remington+model+700+adl+or+bdl PDF link annotation
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/2e31551826.pdfIn PDF document text
    • https://lonexuganaj.weebly.com/uploads/1/3/1/8/131856054/sinige.pdfIn PDF document text
    • https://riwivuzis.weebly.com/uploads/1/3/4/2/134265818/sewemazisejigize.pdfIn PDF document text
    • http://tricitysikhs.com/85819907626lpui8.pdfIn PDF document text
    • http://musc-media.xyz/vuxuxevafisogalaxesogkq0mh.pdfIn PDF document text
    • http://nevepojikita.22web.org/self_portrait_drawing_tips.pdfIn PDF document text
    • http://christinaanddavid2019.com/posurilupabamuwefebojukaivtn5.pdfIn PDF document text
    • https://xuwizaku.weebly.com/uploads/1/3/1/6/131606213/3f6250c39f80.pdfIn PDF document text
    • https://kororopimebopam.weebly.com/uploads/1/3/4/6/134645688/miwurivadodowe.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/moduxanakuri/millennium_saga.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/lajojunowoturobikeni.pdfIn PDF document text
    • http://bapaxezeb.epizy.com/fovopawid.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_43b8a0d5fb864232858792a2bcc0c1fb.pdf?index=trueIn PDF document text
    • http://sarigeselos.epizy.com/63303670234.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_a552e7e449094dca88f33e00eba720f0.pdf?index=trueIn PDF document text
    • http://fadojogepu.epizy.com/a_startup_enxuta_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/championship_2018_19_clean_sheets.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_e92c1bf68d65480284b68b2f1a7840c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/letter_from_santa_template_free_uk.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_e3b95062dcb342d2a13c5497825c524b.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 5336 bytes
SHA-256: 6c4b6efc415578111d92544a24c83b0c9f98b1aceea323b5f4b3d8cc1718e0c2
font_01_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 9672 bytes
SHA-256: 3ae61e19a91fdc63b4c684cd62d01c3d240aa7997e19bf1b71a6269da9df0566

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