Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59cfeb1165c1a3c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-23 13:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 007f3d79c4fe7b42321b743c8e05fbc9 SHA-1: 8b3eac23e8373d518fb9b7a5813d085b82bd4d57 SHA-256: b59cfeb1165c1a3c40927b70b4f490e1181ba50a48bb309b327af564289483ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=script+injector+apk PDF link annotation
    • https://ebmcordelles.progess.com/userfiles/file/dozegib.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/37610240458.pdfIn PDF document text
    • http://idcla.net/upload/files/mukaf.pdfIn PDF document text
    • http://standdominica.org/files/files/jurinatirazolafibagixes.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/pofad.pdfIn PDF document text
    • http://opersan.com/file/wigewudotidigav.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manedel.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/temebasef.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/28600029363.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/xetilu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd9e77df99---rujixurazemomebimo.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/lixulakirarawatorewuja.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/52520331981.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jexewipata.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fatibe.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/16031819013.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xumodenaxanu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/sazapuwusagavekusujepuno.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/pumamajonedulezi.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210922020242.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/52726186477.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/46362506116.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/wolozabesutag.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/9721709021.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_off0000c203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 16880 bytes
SHA-256: 7857b6c05ed3919de934b0e3fbbd934cb4c6e659e0d9aeb4ad16dda3a8cf4f7f
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 10452 bytes
SHA-256: 982c83df57d9fc4dcc73bad9c4fc4daba7aa5f615febc0354148e2d6d9ef3d8c
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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