Malicious PDF — malware analysis report

Static analysis result for SHA-256 399811dfc4f92c65…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 08:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6abdf0a91b13c68015e2314bcb1d8aa SHA-1: e350cc9748a2494f5188541245c00fabf23fb0c9 SHA-256: 399811dfc4f92c65fb82beab8197d9abda3c1805fe2097328e2e8aefa169c14e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fantasymusic.it/userfiles/files/62729171283.pdf In PDF document text
    • http://gallery4walls.com/upload/editer/file/83523088110.pdfIn PDF document text
    • https://buyafranchise.org/files/files/98028639114.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/2063943376.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/24927901565.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/norovunojojupulunuxebi.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/12472510816.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/23589363645.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zavafupukisegavak.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/lusonavafubuwatese.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/rebujexab.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109060038188409.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/durabilokalaroz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/95250360265.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210907_043025.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/woxelo.pdfIn PDF document text
    • http://domuran.pl/files/file/72998389383.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5e557608---73765695503.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909101407356629.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/tanoweluridaw.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pekibamakuwabu.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/33336563963.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nonuzulem.pdfIn PDF document text
    • http://chinalabware.ru/d/files/59220495325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=biugo+free+downloadPDF 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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 10500 bytes
SHA-256: 5aa19c2e1eb21beb16d5f096c0538b6b63a29093e9faab3b71b65babf5c523e3
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 17244 bytes
SHA-256: ab534602d1df484b816cae9872bc3fa576c4b0119474a74f721e0ee5e391a301
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.