Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccafa75c53e8e64…

MALICIOUS

PDF

75.3 KB Created: 2021-09-28 04:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4c6caa7491c95a664f29b5994222b95 SHA-1: 0ece4f86c1c8e02b724ae963f9df38f13033a475 SHA-256: 1ccafa75c53e8e6445597c6918c5866e2cf4c169d2bbedf3ca601d38ca4842c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are likely disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is designed to lure users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://drafthe.ru/uplcv?utm_term=keeping+up+with+the+joneses+full+movie+english+subtitles PDF link annotation
    • http://mygotour.com/FileData/ckfinder/files/20210925_DD4003E530BA2D31.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/tejegepapijopobuve.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/32211104531.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/73894935294.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/vitibizunivu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/xovotame.pdfIn PDF document text
    • http://goref.ru/files/file/wazovizegalarixasu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/1089404004.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/44333665910.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202199205499901.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/74432814975.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210904013158141.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/44489308385.pdfIn PDF document text
    • http://woykoff.hu/upload/file/83869796577.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399e2321a63---bukusegotome.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/nowakepedazujenagas.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/40374545731.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/89255691984.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/41117114951.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pajagosakevabopefudired.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/33469050160.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/xojotesinewesixekemuw.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/35444378912.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/88917888828.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441bd6a0a0d---jozisixegigikedu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/48916152281.pdfIn PDF document text
    • https://inks.bg/userfiles/file/bevisirigunopodo.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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 11056 bytes
SHA-256: 98aaae3fdaf7c7ed97803041a41906ef3b9d573447768f3c6cd89d5e08038e06
font_02_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 19396 bytes
SHA-256: 4ea5d6bf0855968a96c790dc756eb2df355368060a9ffcd161660919c76cb997