Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c213c8d5c29e0d…

MALICIOUS

PDF

78.4 KB Created: 2021-04-08 02:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 014f7437ddf90227c749639fe344716c SHA-1: 72ac73e77b3ac616074b068acb13c62d74683547 SHA-256: 97c213c8d5c29e0d4c47b238be0aa0ef179027b6aa0907736705e689ebf4f34d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that leads to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected this file as a phishing trojan. The document body, though heavily obfuscated, suggests a context related to 'group 3 justifiers question and answers', likely a lure to encourage clicking the malicious link. No scripts were extracted, but the presence of external URIs and the ML/ClamAV detections strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=group+3+justifiers+question+and+answers
    • http://leledup.mypressonline.com/ausencia_definicion.pdf
    • http://buwubaled.mywebcommunity.org/malicious_software_in_network_security.pdf
    • https://cdn.sqhk.co/kesusevuzep/ggogfhv/dodaroxudubuf.pdf
    • https://cdn.sqhk.co/gorubabor/ifgiDih/hashtags_for_followers_and_likes_on_instagram.pdf
    • http://kulirefibew.22web.org/87301772210.pdf
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdf
    • https://cdn.sqhk.co/xumirikebixo/2chbhhh/lukaxomanutow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sujunagew.epizy.com/abstract_reasoning_free.pdf
    • https://s3.amazonaws.com/tamobalasu/bim_360_docs.pdf
    • http://molojagevatabu.rf.gd/weathering_erosion_and_deposition_worksheet_doc.pdf
    • https://uploads.strikinglycdn.com/files/e0845591-c04d-467d-ae8a-3a0b6e947494/wifesow.pdf
    • https://uploads.strikinglycdn.com/files/be122348-3407-4a5b-8094-cba534dc1d95/kuxizuxagexaboje.pdf
    • http://nizofikunatafu.atwebpages.com/51195281656.pdf
    • http://wewapozolebupo.epizy.com/isopropyl_alcohol_ipa_safety_data_sheet.pdf
    • https://uploads.strikinglycdn.com/files/1296a546-7e7d-45b5-bd67-b019f9b035f1/jixovaxogezorur.pdf
    • http://jefuzogal.epizy.com/31912425351.pdf
    • https://s3.amazonaws.com/sazixipame/94061644074.pdf
    • http://maretubozewugi.myartsonline.com/pdf_to_mac_word_online_converter.pdf
    • http://liduvitulugug.onlinewebshop.net/gopunaka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23b.bin
bcb8d29a8da4541ac23b957edb2487703ca060ab1d7366cecc024dc52c5b02e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 5492 bytes
font_01_sfnt_off00010510.bin
595e79241aa3b753302e91bd84d8ad07d9ab2e97345d99852965588053013bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10912 bytes