Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabae6159e3af423…

MALICIOUS

PDF

70.4 KB Created: 2021-01-06 07:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2a10d4843aa1e257da142cf6c8536eac SHA-1: 6359bd5c89822f6267f001bd19b082b40cac56c4 SHA-256: fabae6159e3af42368c1404723f66c777c569841665a661aa12cecfe58401fa2
236 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it contains a large number of external links, potentially for SEO manipulation or to host payloads. The 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_BROWSER_INSTALL_LURE' heuristics suggest a social engineering tactic where the user is prompted to download a password-protected archive or install a browser update, which is a common method for delivering malware. The presence of numerous external URLs, including one pointing to 'trafftec.ru', further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafftec.ru/aws?utm_term=tutorial+axure+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn.sqhk.co/fuwunikuneg/hddktib/95959309201.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/iRFjhgd/boysen_color_chart.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/cb16a01c383ca5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384471/normal_5fc4d92838a89.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/hjzdHge/liverpool_fc_programmes_2020_21.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/qjbxhd1/pixel_petz_discord_server.pdfIn PDF document text
    • https://cdn.sqhk.co/jorobasobu/ZyRceqE/lisose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajezife/womalaberugotazifefeze.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/wrist_exercises_for_arthritis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867866b5-8981-46df-877f-5d7856633be3/suzojuxupobirono.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/simple_harmonic_motion_gizmo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/antique_olive_pro_black_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/sch_let_s_learn_english_book_2.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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 5264 bytes
SHA-256: 1b95cad3fac7932b627cbcc602a25c542da232082f68ebb61557a2332fd95308
font_01_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 11920 bytes
SHA-256: ff1c753747bd04d152eb832ed5443616f7be7e0d968b1c5c26ce6b968318ef0b

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