Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea79a2e7c40a59c…

MALICIOUS

PDF

71.6 KB Created: 2021-10-04 04:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d831b6d4748f921cae29a3307e452fde SHA-1: b74340dd76be144f4a2aa2d8f70202b415fcb6af SHA-256: 3ea79a2e7c40a59c48b80e1b18e479d151aa44f485da9af2d2b8775bb31ea678
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the presence of many unknown URLs points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://fivetc.vn/uploads/files/37914424285.pdf In PDF document text
    • http://indianspringhomes.com/userfiles/files/pavujakag.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/29210007168.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xelutenixinomo.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jebexatij.pdfIn PDF document text
    • https://wiltech-hk.com/editor_upload/file/83488464391.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/63770431141.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/16378444799.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/tobuduzasegexi.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/71636405842.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/23478730983.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/89053923660.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210918140407.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/17435176852.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6f129e671012673c861979af5acf745/88476224810.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/muvukoti.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/38656263919.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/8435777567.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6277d8eca---48080804288.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/davopifudarar.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/wazakov.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/32932015918.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210907212442.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/dinosiposijomuvovut.pdfIn PDF document text
    • https://tunapvietnam.thietbiotoviet.com/Images_upload/files/20691728060.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/lanatetupo.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/23206278635.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/29384418199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=paid+music+player+apkPDF 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_off0000b779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB779 15976 bytes
SHA-256: e3dff675c8827a942fa4b16a26c16b512fa72e911b0ac48dae875a1794ff74ac
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10660 bytes
SHA-256: 44fefa6e01dcfab6bce5213813d363424e8f94d041b881882319b59d58c65cb7
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1