Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cc97376450983c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 03:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8cb01a05a746850063ac2269d5c0d40 SHA-1: ae34c52fc532fbdd2c0d4e9d9a2b6d8822b476e0 SHA-256: 06cc97376450983cc108d67754be819e793627ee08a9f80066f51c4b71ea3914
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://eis-pieschel.de/UserFiles/File/gofowiluzobumi.pdf In PDF document text
    • http://sangjeom.com/userfiles/file///34147393974.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/63921510463.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/bosobige.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/87847558964.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/weziperad.pdfIn PDF document text
    • https://lecachet.fr/docs/files/pawojorutagelalef.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108312314064515.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wizigajuxotijidajem.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-17-10-17-77.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f60066d15---gosojavigupariv.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/joxazuve.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nidimebimo.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fidesodivoxipo.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mawewujanifelu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/gadibimanerotez.pdfIn PDF document text
    • http://yjccnc.com/upload/files/mipuseriwopu.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/86440485292.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210901_033552.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/2192551253.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/89645830474.pdfIn PDF document text
    • https://onlinendttraining.com/files/tokowebigasesusok.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/gubudebapufefepijogi.pdfIn PDF document text
    • https://ivanamihic.com/files/16815222341.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6693e8261---konodin.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/85758322977.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/tefevazujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+custom+rom+without+pcPDF 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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 17612 bytes
SHA-256: 213d6e7d6438f911bed6b7956830d55dd058bbc2b72444fffff811407e8dc430
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10684 bytes
SHA-256: 7f0d144e26a4acaf1ce6b6cea5fa01ed235773a340936fce8c003ee98265b58b