Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac7c8d4c783930…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce0c14c23de6119a010296b2dbc3857d SHA-1: 8bb8952beef5d35e14c49e3c1a3e632cd6b8e346 SHA-256: 89ac7c8d4c78393046e3e223602e39b8775e1c0be996643fc2a7ef882bb9fa69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bishopsalamatkhokhar.org/userfiles/file/mukuxaliwodiwuv.pdf In PDF document text
    • http://lemma-studio.pl/userfiles/file/wasumenebevedagekomu.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/45329728307.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161305aab891f1---fimimezodixanazubeva.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/63789692025.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401259bffe7---31703853138.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/lugibo.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_51F9CA2438ECB228.pdfIn PDF document text
    • https://digiconelectronics.com/media/27863877729.pdfIn PDF document text
    • http://air-ned.com/uploads/files/novuv.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/mizejamob.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/51547177800.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/94800962489.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_259E3C4875D03D18.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/70708885290.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/kevaran.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/tosemojuvoxemovikana.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/14531383371.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/40313912814.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/sumax.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/23160008723.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/92518429452.pdfIn PDF document text
    • http://learningkey.org/userfiles/6637849357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+apps+to+speed+up+androidPDF 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_off0000ad5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 15220 bytes
SHA-256: 8c6445a4fc7ba697fb72de3966a8e50b0e50b52e8e02a93f1efc99ec84568d25
font_02_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 10492 bytes
SHA-256: 3fd575568db8013367058d12d1b9c959eb9f53bc0c62489bbfd4dcd38bf53b6a

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