Malicious PDF — malware analysis report

Static analysis result for SHA-256 df621e50ff989550…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 21:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dff548b7bb46d9ba12b8c7c4c3d2a2f6 SHA-1: 6724180b4d049da2dd352a7fe068268e4ddd58e7 SHA-256: df621e50ff989550c7297c9a21fe3684c85284b5047ff27296a816c17e1a079c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a large number of embedded links, many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://komunalno-vrgorac.hr/files/80540456886.pdf In PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/1971613483.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109111150388010.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/rolizusizajotonupanef.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210920_084512.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/juputowunodokebafegesiz.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/puxaretivofibuzaxa.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gumovoxaribaxusa.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/83385714573.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/62604295821.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/xokowurabuda.pdfIn PDF document text
    • https://limsurdua.com/contents/files/paxobikedut.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/81404399629.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tosuvamisekisurebanuxadi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec3d02064---devibedinu.pdfIn PDF document text
    • http://kes.org/upload/editor/files/kogefadamatesolozup.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/safora.pdfIn PDF document text
    • https://digiconelectronics.com/media/mezazilepu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/21055835231.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/88427567569.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/kikuf.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuwoxud.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/73370743437.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/gadipijokax.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a66f54ca4---49583491096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=two+player+games+no+flashPDF 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_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10776 bytes
SHA-256: 6fa59eb94f5d27b0cb0942546469ddd8e2c03e716643ffa98979ab827b0f5fa5
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 17580 bytes
SHA-256: 99a3284ca8d611932f9c106d12bbc0674a50ad77933094563010d32db3a351fb