Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5b2c194496447f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 05:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2b5fc389a071e80fa4a685b81b87d8f SHA-1: da5700bcb286e8fc96826f695d6afc2dad1bcc72 SHA-256: 7a5b2c194496447fbf98f208da41069f1478aacb3213158adddd2cefba3c89f8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. Heuristics indicate a payment redirection lure, suggesting a phishing attempt to trick users into changing financial details. The document contains numerous embedded URLs, many of which are part of link farms, likely serving as redirects to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://huntic.ru/uplcv?utm_term=not+receiving+text+messages+t+mobile PDF link annotation
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139499281b5d---26019811516.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/xudinibe.pdfIn PDF document text
    • http://linza-market.ru/upload/files/71801789613.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/91557928661.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/fofaradozisikopejok.pdfIn PDF document text
    • http://sdes.in/uploads/46061431886.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jozoka.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/fogigikorubasul.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/90890023175.pdfIn PDF document text
    • http://twilaw.com/files/files/3803555126.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/71229285864.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b75efc5bcaae3fab47d1efa7266f30c5/62561048504.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/ruzonawovav.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/reviferegugenunagamu.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/nanedodedobusuxolik.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/fujigez.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/luwukum.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/tudobevifenu.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/6404677551.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/padubigevasalun.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/86113157023.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wizifovubararolabeseviza.pdfIn 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://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_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 10860 bytes
SHA-256: f4e5f5272a1c26e2296fe90b937e477b684bdfb5ded50dcf14816f110f61da40
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16984 bytes
SHA-256: 0cdf2accdb04ca21811f3d197b3ce6d8f724f982e0b12722fa331b3c10720a6e
font_02_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1