Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3fb253c4e23e9b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 15:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3fe53da219e9840498ebc5c9e3874d1 SHA-1: 4bfbb54d3b3044a6a8e48a3429837c16cf7e2915 SHA-256: ce3fb253c4e23e9bc77d23811586d4767ba0b7172ec4d96c75c11ce7823e48b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs, including one pointing to an IP address, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic indicates a social engineering lure to trick users into downloading further payloads. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest the PDF is intended to facilitate the download and execution of additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=download+wreck+it+ralph+2+full+movie PDF link annotation
    • https://creteotels.gr/FCKeditor/userimages/file/fazenawupupiwani.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/68250691907.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/28979839834.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kiduzekipidixopud.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/50012229635.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ada1ea7be---zinef.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/99724598286.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/pogulelixatunatobode.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///82662921053.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/liwezorug.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/17470425145.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/14759408710.pdfIn PDF document text
    • http://mp-journal.com/media/file/zabokomevepo.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/fitigunokipapet.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/68562744418.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/nunamuwunamumipuderuxareg.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/radetolimokenab.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22bf7f4c9---93331837958.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/30789523791.pdfPDF link annotation
    • https://propiedades.net/ckfinder/userfiles/files/18584801830.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/37578899736.pdfIn PDF document text
    • http://osayit.com/images/file/nekakewegawonazitiputaba.pdfIn PDF document text
    • 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 11184 bytes
SHA-256: ea7d9d60c6714e8d980007821f13645d7451de5579058ced5a60132b3b1d893d
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 17692 bytes
SHA-256: bb43de92c64656e85faa3b0d7023ab4485c68f91698f7b861c3d6236e3518447