Malicious PDF — malware analysis report

Static analysis result for SHA-256 87849ef57c1f89ae…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 16:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cc481777e8c83e63a1d87a0345a7365 SHA-1: b2ffca09971ab510377fa4fe21c583439a92ae4e SHA-256: 87849ef57c1f89aeeb25da66d494b143ece6643c7f87680ef99358f042eff24f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://world-housing.jp/ckfinder/userfiles/files/nanegorumumusepuvuki.pdf In PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/58389601597.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378435e8eb2---xukigujegusodasex.pdfIn PDF document text
    • https://deepex.hu/hirek/files/57196125000.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903023328_682951366.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/68467620842.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/80714294356.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/jelunufegonuzesigiguxeji.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/vusumaw.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/laliviwesejelulupo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd070c1436---topobewozisamopukugidaw.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/letumujedulirexaxeluz.pdfIn PDF document text
    • http://tochuchoinghi.org/files/42825967109.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/89386627792.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vusurodivo.pdfIn PDF document text
    • https://pellevah.com/upload/files/laxawukalujodipuxijesopa.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/98818834921.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/vuferusonujupanukod.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/59627523961.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/xerudewawagaxibexaxotas.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/38727813843.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/xeredabevarixomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+episode+167PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 22212 bytes
SHA-256: e9b5142c1c3cbf91eca07cdae7a19c8d3cfae72361b7a6e8d1b473f362ba5a5a
font_01_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 10940 bytes
SHA-256: 0fa45b5d8e66709b7d40267eac036ed48366a6034852cd858a644dd450987412

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