Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8f51bee78c300b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 05:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3441b2a1489cd44aaf9f1a8682cf15a SHA-1: ae597e4fcfa33af9744ad181fb10c52a6a4ae79d SHA-256: fa8f51bee78c300b5f821d97e19f25a079136292dd547f3b2a7ac1467ccbae38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or redirection mechanism to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host many links, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ljlconst.com/admin/images/file/rovevezizeparino.pdf In PDF document text
    • http://bachtungcompany.com/upload/files/68210550532.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d030c71c5322f38a6e1fa34b73d975ff/32426841347.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagila.pdfIn PDF document text
    • http://parentini.it/userfiles/files/baxolifalano.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/busijiguzafabenexomi.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/45299141608.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/mopinewila.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/faduvaj.pdfIn PDF document text
    • https://cape-electronics.com/media/file/72021788505.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/gonoxew.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/rovus.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/10701314954.pdfIn PDF document text
    • http://www.centralperdana.com/file/nesadebulodar.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/96955659307.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/maxaduponadekusumido.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613368a794046---wopitarifotejon.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/75089138737.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/92974914694.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210919130654.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/21888080491.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/rizunawafo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/52765028967.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/tolopoparawip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ultfone+activation+unlocker+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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 10652 bytes
SHA-256: 7288229b47b146a7aa9f0c9478f5ef08357828f989aa3995ed0c12a7da49ee48
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 17972 bytes
SHA-256: 1cd037437ec1f02a6a3a4c9a6a4e1d40a06f0a49560d26d4871dfbee234edca0
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1