Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f01ac9cce7e54ff…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 23:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 424a56b97d3bf09064d9156a74f04f15 SHA-1: e0c3969f930715dcf73d8ea00dbeeedfaf3973de SHA-256: 9f01ac9cce7e54ffa1790491eeb7741a1b0294a9872ed1029a18864e7e13a6cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many sites. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tristar-technology.com/ckfinder/userfiles/files/10136638184.pdf In PDF document text
    • http://cl-metalparts.com/d/files/78061508932.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/34302067978.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/meleruwerorojoxipuxut.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/40720771471.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/18168652193.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16146011eb02f3---61901408816.pdfIn PDF document text
    • http://polipack.ru/content/file/25225043156.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/xowuxo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc32e9dda3---dakexopepoginemusef.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/lonoketafevojojogejiwifu.pdfIn PDF document text
    • http://pbpharm.com/upload/files/mibuxobivefapifadu.pdfIn PDF document text
    • http://mayjack.com/upload/files/71788765118.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6111e254---46225951930.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/vitudakifatu.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/67745238183.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210919005117.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/17627380510.pdfIn PDF document text
    • https://fratellifurloni.it/file/ziburabox.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/zezoliwarasikajaxabupog.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/waburof.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/67032759585.pdfIn PDF document text
    • http://shesob.com/file/files/13608632145.pdfIn PDF document text
    • https://rajakedua.com/contents/files/55733877828.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/xilebevezikogemolebiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=eurosport+player+apkPDF 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_off0000b25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 10340 bytes
SHA-256: 52af88aeed5e8a74e196a45fab2ba792231858034328bdac64e7f2a301e271b2
font_01_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 16648 bytes
SHA-256: e1b1a571454356f744b30fe996d89712243c027116787946cea9f9e462923566