Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63417353a79dfb…

MALICIOUS

PDF

72.5 KB Created: 2021-10-11 08:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 144f99312c13ed4415534be3493ed0e6 SHA-1: bebbe1157dc8fa3c00fd2a36f26fae496efee53b SHA-256: fb63417353a79dfb5f7902e875997b99fd53c3bd8c30e3b6b326a3d9eef0e79e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to domains that appear to be part of a link farm, suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=alabama+motorcycle+license+requirements PDF link annotation
    • http://computer-rudolstadt.de/upload/file/65030281484.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadutifi.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/senupotoxozifaxiwu.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jirux.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gidefu.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/bakibokavugipagi.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/xuxekogerenedabawevejik.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/gigunoxuw.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/23699382466.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/89089870562.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0f67683a---bekuxapijofujekebumerogo.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/77711902688.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/23879440402.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-24/20210924224420205308.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/golisitawu.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/wibelavanas.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/13878984300.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jexiboxaziw.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wuvovaxadejagovamilenotem.pdfIn PDF document text
    • https://znalac.com/userfiles/file/tanawavuzuvelerure.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/am10r87c6fktljjv6jnplp2rl9/3878959719.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/71687874245.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/wozuzimopapinivizatozeri.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/88688582731.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/10774510570.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/11728276709.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_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 15992 bytes
SHA-256: cf90504a3a934fc099e685dc86699359ab2926db564b03b9f355d1df2c68ecf7
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10872 bytes
SHA-256: 29979fef69c06d7c11a141376a047d3f44a6623581993b915bd34cc53884d43d