Malicious PDF — malware analysis report

Static analysis result for SHA-256 be492118cf40e97c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 06:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1466ebff7c1d92a90b8251bad1969850 SHA-1: 67e292093f9a31d3176dc4abbd16d7c72a6c0816 SHA-256: be492118cf40e97c5af96bbe34c0c4e5e4e629d62c3532264841d25bd7a06116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a link farm on disposable hosting, with numerous links to PDF files, indicates an attempt to direct users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate the download of further malicious payloads or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://mystruggle.uk/indigo/ckfinder/userfiles/files/82565735846.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd95204a28---gipeliboralalerazami.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/41968418334.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903041008510331.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/gixinojopuribevikig.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/84664151687.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/28177164684.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/nozabajabevowovufitot.pdfIn PDF document text
    • https://tessuno.com/upload/files/613ebcd1d7263.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/94048966658.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/91049656854.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210913_105853_5024.pdfIn PDF document text
    • https://kar360.com/resimler/files/vukuzumovukabixufogabaw.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fabitukipimofitemigete.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/31127927119.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/butule.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109081414157657.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pevijikojeduvumexu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/nimigo.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/felobejabovineligo.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/tusumalonoze.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/34497166408.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9fa09233---24520326396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D1%84%D0%B8%D0%BB%D1%8C%D0%BC%D1%8B+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+hdPDF 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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 20376 bytes
SHA-256: c9677f94e27a99b343c93e437a73e6cd2be7376e73bf572c90326dd6267825db
font_02_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10984 bytes
SHA-256: ad994a4868d5a3e70e8ebb7618503be6534e6166fc0e685709c0935c60f62547