Malicious PDF — malware analysis report

Static analysis result for SHA-256 4128cb05c2db1ced…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 06:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab69505d308a606977244ca9d44b4103 SHA-1: aa719db14c1b83a87e059d361aac29c07a4f2ea4 SHA-256: 4128cb05c2db1ced9a21bb36f0df182c0f6b2b5835cdf981b27576c045b4cb40
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many distinct links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

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 http://hz-kontejnery.cz/ckfinder/userfiles/files/88166761772.pdf In PDF document text
    • https://brillimet.com/uploads/files/202109032059072088.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/pebim.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/feee579f4f02aa6dcab0551b917dcaac/vadutavudakimorole.pdfIn PDF document text
    • http://poliinc.com/upload/files/zawuziguba.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/65458067595.pdfIn PDF document text
    • http://glttek.com/userfiles/file/gitixo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02da88fae---nefojadeku.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/menokovipoxerisojopibaw.pdfIn PDF document text
    • http://spiregene.com/image/files/20210907_141403.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/jevopemexasi.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/beboxesuriga.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xoduga.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/77100211119.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/24225435608.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/54683849760.pdfIn PDF document text
    • https://kuepancong.com/contents/files/93895789105.pdfIn PDF document text
    • http://co-mit.com/uploads/files/zeredavuka.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/dukutenowurolelajum.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tozizazatarek.pdfIn PDF document text
    • https://ebooksweb.net/files/file/71967179171.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/54666482515.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/40634899192.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/soxofiletivinujuxeleduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+sweet+romPDF 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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 19400 bytes
SHA-256: 6d99525a120753df271fb589f903a91a6fbf87d7a17568e5206753ee3041df65
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 10148 bytes
SHA-256: 29bf9e83a5432fdf261d0e19eeeb15587bb5eb59a6de7713b87ef0b7862aef41

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