Malicious PDF — malware analysis report

Static analysis result for SHA-256 befdda905ac09e75…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 00:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bd7b428ddb6ed4e1a092788b1becc8f SHA-1: 2452cd5d87d6a85515cb72a6c7f89d07585783c4 SHA-256: befdda905ac09e75c93ba567ae4b9218b096f6dcc8b39c2c0955204bd024d6de
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 trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple external URIs suggests an attempt to redirect the user to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://malir-naterac.info/UserFiles/File/3949585802.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nopug.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a76016b6e---jatobisuku.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/60004108248.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/fimaj.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/pubetejobabobu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/41726182167.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/26783127226.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/binulifitesulis.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/60377006536.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/suzofumazozudosuroxud.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161304b8840b57---dekotamoj.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906194635_wmr9ya.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/61019565230.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/28105406614.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161364f34c0f0d---54566246684.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/78739433750.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/fonekumega.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/74783887644.pdfIn PDF document text
    • http://intersonik.eu/upload/files/62717769967.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/tudigamitivaxafogegamupo.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/wujodebutonazagumuxifa.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/28164037354.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/tonezamogefoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+5+for+ios+download+freePDF 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_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 17532 bytes
SHA-256: 015ce085ab911d45706fbec5fca884e2e05bbf23d66c4ee6c79768a422161880
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 10608 bytes
SHA-256: f271c9f4769624e9932906adeffa78d37c4903497beb67f10ae7250948341424