Malicious PDF — malware analysis report

Static analysis result for SHA-256 419419d1b5a21ac9…

MALICIOUS

PDF

85.5 KB Created: 2021-10-05 20:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1d2d71b4d1b36585a532c18914c0a9da SHA-1: 9ca1bd45ed4aca263f23fe8f3ef9a2aa4e5cadcd SHA-256: 419419d1b5a21ac98bb113e688f4b947f87e7da27ddae8a294b067afbf553af6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further confirms this assessment. The primary attack pattern involves luring users to external sites via embedded links.

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://inwebjor.ru/uplcv?utm_term=the+lottery+1948+shirley+jackson PDF link annotation
    • http://historia-bfured.hu/userfiles/file/13320160658.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nusipak.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/67571072169.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/56478956660.pdfIn PDF document text
    • http://airfa.it/userfiles/file/bibuzaxalimazasi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/91336812735.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/rimatumexelawefupal.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///mututufapufogoxujuwu.pdfIn PDF document text
    • http://scarpatti.com/files/mamorarepolovutezuzudoso.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/25225176100.pdfIn PDF document text
    • https://isgz.me/userfiles/file/68312391451.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20211001_D280350137F43379.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/18861065910.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/78780072546.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/51d2cba93819f14a3e8eac02cae110ac/74696155135.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/watoxezajejitunixosiza.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/zimakadudobu.pdfIn PDF document text
    • https://tepihtrava.rs/files/gekerixerakadoj.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/42763546355.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/526e22525ce9460be54aa391b1a95581/duvitikug.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/febav.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/24211122785.pdfIn PDF document text
    • http://hanleyresources.com/images/77735480612.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/96012062819.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/68126854291.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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 18044 bytes
SHA-256: b6f63149812a746473870e5ccaaa383ef66d3fc9331f99bad67199c7dcaf2330
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 11132 bytes
SHA-256: 587fae1449a62c6a34fa18170441814054ce196045231c4c66584f98a4914d41

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