Malicious PDF — malware analysis report

Static analysis result for SHA-256 112bc884290dfac3…

MALICIOUS

PDF

89.8 KB Created: 2021-10-13 11:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d2fbda2a7ed90006cf39a489199943b SHA-1: 790c20e127dce8b21c7668c48b0b625a08404e58 SHA-256: 112bc884290dfac39b0282c2039bad13b83b67caacfc78d53f9656061ea3c291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ecodiagnost.com/ckfinder/userfiles/files/revadivoxujetupakileriren.pdf In PDF document text
    • http://conblocmanado.com/pics/file/7129330485.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/bulasenupijiforomavopa.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/39703137320.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/10219464620.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/doraxikofijifopoveb.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/9942226996.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/gudejaxibisoruzatijap.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/jebekomafilizudowozelur.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202110111700077092.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/dimesejokujaxutokekidago.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/wenufopenedowabamixuzo.pdfIn PDF document text
    • http://adice-area.com/pictures/files/sujukinoliriraxo.pdfIn PDF document text
    • https://partnermind.cz/images/files/nikalemobijutiroj.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210920180258_b26m5l.pdfIn PDF document text
    • http://i-dron.cz/data/file/rovotaluzezavigezam.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/51878759482.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/72996185943.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615c23f5ecb9e---13080202681.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/zuzopawuki.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/muwulonutaso.pdfIn PDF document text
    • http://namngonviet.com/user-/files/funabuzaxotesakizixavukas.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/vaxeka.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/28864072149.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/32417e61b5ffe923b11639f437653f44/16782612624.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/10747461640.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=railroad+tycoon+deluxe+manualPDF 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10724 bytes
SHA-256: 4f4c67c30f9ce8172a022f08adb45a88fb279b08308786fc6a9c5e21099a22a8
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 20948 bytes
SHA-256: 1e88970565b4d6c2bbc934b6ce37b20e9f71f0d394f4041baa6e4bacdfeca1d1