Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff5c36cd5046d7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec04d6061fe794cf94d0732035cb19da SHA-1: 4308218961a6d1c368e77f2d97795bd58a9d6ff1 SHA-256: ddff5c36cd5046d7a43bc079ae0bdc8e9ee98f1f74207b89f71216cacc98dcec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://botosani.ro/img/uploads/file/77706491123.pdf In PDF document text
    • http://sandlnae.com/data/editor/file/54966816517.pdfIn PDF document text
    • https://ghnservizi.com/file/54023012400.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/gubuxawaziv.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/duverivow.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/46752155973.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/muxuniwobalosawosadusom.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/72357188654.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/87304562721.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/3136283585.pdfIn PDF document text
    • http://www.siposferenc.hu/html/24483808046.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4915789d---vinagiridabifasabezib.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210907214227_knj5tw.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/bazelisixudewokaz.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/buferijegusatipujifesop.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5337ed685---285633837.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/duwitofuveduxututavisofel.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/sexaxanofedodo.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/nijijo.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/52053880489.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/miriwubowux.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60111873374.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/zibigifijibov.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bifaboba.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/bigezopawaxumunuriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+does+no+root+meanPDF 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_off0000c574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 10368 bytes
SHA-256: e41ed20b257184a85cd8b39e5e8cc23f9a24ef21f92cc059f5261805ff4cae01
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16720 bytes
SHA-256: 37331f8abe2fc4e0fb4a304c0d88a4d8a6c06157a73a645b49972bf542996380
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1