Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa01b4622fe0c08…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 08:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b30079bfae558205a032eabf8449e0b5 SHA-1: fa69c50e508867942c5a396cb7ced2e728498f4f SHA-256: eaa01b4622fe0c08be25e73eab2bb7106c2bd7b38dffdbdbedf1c58c1bfe5f41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

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://hamzsabegi60szallo.hu/UserFiles/File/5900421359.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/sosuvezasifezowu.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/88944183871.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909010636.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/49431790063.pdfIn PDF document text
    • http://belniig.by/public/file/wutuzetepirirevaratim.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/dasaseg.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/punanagukos.pdfIn PDF document text
    • https://renewone.de/files/boneborojupewuluwagikar.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/kugagifotabiki.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ed9373f---10425376509.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/49784672723.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kagarafap.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/78392803475.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/ximeraveg.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xobekodizavasel.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/gijizurupowipupugonuwem.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/taduzuwunenulurupevamup.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/18151936611.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/89114877491.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/99324510076.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/dezuma.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wuzukesejidukusufokajez.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/9597988866.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/7095162685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+file+for+ppssppPDF 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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 10576 bytes
SHA-256: ffade4de462af5fa7acd0827bb373ede8723a2547a5ea8026be522f38889782c
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 18432 bytes
SHA-256: 1774c4a381266426f9e69b2d6adfd60c7dda9da6ce15a59c6935e6950361626b
font_02_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1