Malicious PDF — malware analysis report

Static analysis result for SHA-256 759344ca8d55ea12…

MALICIOUS

PDF

72.0 KB Created: 2021-02-13 15:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f16197abd3be3d09bf693ce84c9d2dd SHA-1: 9102ce45bfbd5cd0fcfb3091980f9827d23c8632 SHA-256: 759344ca8d55ea12878afff6b008ee4e3f5e3ca4a607550d9be21c9499055540
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=industrial+craft+2+wikia PDF link annotation
    • http://biomaniix.website/warhammer_waldelfen_armeebuchzobvj.pdfIn PDF document text
    • http://vutatux.22web.org/siwinotusodu.pdfIn PDF document text
    • http://pc-remont.website/imo_app_free_desktop2wzql.pdfIn PDF document text
    • http://jobs-ingenieur.best/kukux8zefg.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/taruvapogugavogoke.pdfIn PDF document text
    • http://gdztut.com/galvanised_roof_sheets_box_profile7m09l.pdfIn PDF document text
    • http://vinograd.io/mercedes_c_class_owners_manual_free_download5a7kh.pdfIn PDF document text
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/ac41be77f5126.pdfIn PDF document text
    • http://xoguvux.22web.org/steam_calorimeter.pdfIn PDF document text
    • http://biolinkus.me/221843941396b3t9.pdfIn PDF document text
    • http://deemonatrafik.xyz/mavulakexawajicbwyu.pdfIn PDF document text
    • http://puwofipafemuvif.22web.org/59367879311.pdfIn PDF document text
    • http://cparta.moscow/beaker_full_version_apk39q9k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotepugiz.rf.gd/rupitijewanasizobarikos.pdfIn PDF document text
    • http://merapuw.epizy.com/kerujidovukogalisig.pdfIn PDF document text
    • http://fipotunisobojow.epizy.com/best_picture_collage_app_android.pdfIn PDF document text
    • http://xewojof.rf.gd/67907818642.pdfIn PDF document text
    • http://daxepusiz.rf.gd/application_x-_www-_form-_urlencoded_resttemplate_example.pdfIn PDF document text
    • http://donenufalu.rf.gd/google_chrome_security_certificate_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 5240 bytes
SHA-256: 1d9188a1f3d34f130a0117235641fefc65fb67ce838b259800af391bca6f9948
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 11884 bytes
SHA-256: c4d146daa2c97ff20d92211d8495e196537b61d6ce2bdd2038a3db02db44dc55