Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26cc23b7d17a000…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 02:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcdfc69300beb27ae0b828de7dd7ea72 SHA-1: 3f2ace835820bd1fffd13506daaf16c824b8629d SHA-256: e26cc23b7d17a000f25554636a1af520cf30cdc679ad0cd00542852befcad935
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure for downloading content. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://balbu.eu/uploads/news/file/balirotukenatobozus.pdf In PDF document text
    • http://champaigncursillo.com/userfiles/file/gexunabifolinezuzam.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/patuk.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/rupatumosel.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/varinuzurajidamap.pdfIn PDF document text
    • https://esz.jp/img/editor/files/62469290522.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133413531cc4---xodatatevegulab.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/34987729883.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/27157032440.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/liwofodesazajibovomumog.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/xojotupopirisuk.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/80643093983.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wadasipo.pdfIn PDF document text
    • http://kbchina.de/upload/meramuzom.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xisizisevaxarud.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909075321.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/4fcf0f0af008cdd0a9f2271087452aaf.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/37796463384.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/44414379911.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202191181735343.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/kodupolajogasawobuz.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/94051721030.pdfIn PDF document text
    • http://techmechengineers.com/uploads/24733867083.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/xilab.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/medugasipu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/pofakonevapavo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3aafsokcabki3iama57stuv2aq/63401316691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tom+and+jerry+apkPDF 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_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 18808 bytes
SHA-256: 459a67341b4bffa1de8123e598caff7d67dbbb44082d57322fba71d817df1569
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 10448 bytes
SHA-256: 40e8d44b3f20bb75a08034a9bab382ea6f7b698d78d33b1979c9009d647345d7