Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce41b7ab785a625c…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 15:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9e88397d8dd678c44a3e628db2b79e SHA-1: bc21aa048083e1504f2ff3e8bcc3e66371a83b15 SHA-256: ce41b7ab785a625c10636ce608e18622b5fd45045d14889b9b99100b0c255b6d
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a URL that mimics a search result for educational content, likely a lure to entice users to download the malicious file. The file's metadata suggests it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise malicious links.

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://seumenha.ru/wix?keyword=solving+systems+of+equations+substitution+worksheet+answer+key
    • http://good-production20.site/buenos_dias_mandy_original_comicvf03s.pdf
    • http://tusukezilineji.66ghz.com/75363522458.pdf
    • https://cdn.sqhk.co/luwagoma/cqLd4YL/kusapikitomin.pdf
    • https://cdn.sqhk.co/rapovixovuti/uYgceu2/vevefikutefa.pdf
    • http://groshyk.site/14990684916cf5yb.pdf
    • http://frut-tree.site/gifewnhs2l.pdf
    • http://shmelev.pro/31434232249rxibf.pdf
    • http://storezone.info/kukiwomatogarewajuti90cd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tobavukopipe.epizy.com/caller_id_changing_app_for_android.pdf
    • http://jegepifewomu.epizy.com/70588176575.pdf
    • http://lozepis.epizy.com/74555870510.pdf
    • http://sirusuve.epizy.com/pajumixiboxotug.pdf
    • http://mupufekugix.epizy.com/lazarillo_de_tormes_prologo_english.pdf
    • https://s3.amazonaws.com/mexavofezoxi/finished_goods_inventory_on_the_balance_sheet.pdf
    • http://vekujekodabudu.epizy.com/aldiko_book_reader_pro_apk.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_off0000e2ab.bin
7906129c59c4dd36470efc3104f46a1a46a23187bfec0466c4303547ae56ae13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5868 bytes
font_01_sfnt_off0000f695.bin
0cb7f53c73890c6de59c56a122b2a577454d21a11bcebbc47eba62204e1c89ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10672 bytes

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