Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a1c6c5f8c7183c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 20:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52b38566d4e65026495e46d2bac4f7b9 SHA-1: c99dd6f09523a1d5876c4a99cfdd1fe5fff62220 SHA-256: 34a1c6c5f8c7183c37eb6a1ed7294ec2d521a06237d12e11750a9096a8d470c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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.
  • 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://lovesenergy.nl/file/46886392231.pdf In PDF document text
    • http://xiangzhuan.tw/upload/files/15810480063.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/37419795025.pdfIn PDF document text
    • https://csn-alliance.com/data/files/64266369203.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/53212084976.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/gefejemunixuvale.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupanasumoravusa.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/faguwigiko.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/nusosixugupivuluw.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/fifamuj.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904061732611975aonzboi9wf7r.pdfIn PDF document text
    • http://camonetinternational.com/files/file/gotakaxilupadusuke.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/48148485245.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/52313352806.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/gapaneludevolo.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/janenozazofatir.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/88417360688.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/55921325663.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/76723380639.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/82365647068.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b44fc0bad---pevodugezagawidulasapew.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/rizaw.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rozexijewoboset.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zojet.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/zugifudivakedufunazo.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/bataja.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7a59122ea28b5a8e64028f04e2fe39dc/galoduloludeposig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=handbook+hvac+design+pdfPDF 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_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 17828 bytes
SHA-256: 8271ddc369f8eaa39465910d14d257e28d40040358afa58840b58be92c1e08d2
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 10944 bytes
SHA-256: 50e114b98f658fa0a5e4dcb20e517c739c2522b9b47bcd52de96b327371c32ff
font_02_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1