Malicious PDF — malware analysis report

Static analysis result for SHA-256 334c88fe8ecfec96…

MALICIOUS

PDF

70.7 KB Created: 2021-02-17 10:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a77698a9b654e142027e6cc5af6bf9b7 SHA-1: aa577027c619ebb06c7e43ad90e04fa8da2e3861 SHA-256: 334c88fe8ecfec96ab929059bf7a314bc12bda62e66859c480749cf425781ecf
162 Risk Score

Malware Insights

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

The PDF contains a link to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated, the presence of a malicious redirector URL suggests an attempt to lead the user to a phishing or malware distribution site, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=transition+words+list+high+school In PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5ff8583e4de4f.pdfIn PDF document text
    • http://svoylend.xyz/60003634991otzud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600a3da78a1ee.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/48db0349f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425506/normal_5fc8134f72c51.pdfIn PDF document text
    • http://ezfix.asia/95182004443ufmwq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408002/normal_5feb46f82304f.pdfIn PDF document text
    • http://twirlini.com/profit_and_loss_format_excel_downloahlj26.pdfIn PDF document text
    • http://profaudit32.ru/motor_vehicle_service_notification_pink_postcardgvr0d.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/fefb3eb02.pdfIn PDF document text
    • http://it50discount.pro/82585674052s1pkd.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/checking_available_balance_vs_current_balance11vfu.pdfIn PDF document text
    • http://frankiearvelo.com/trx_force_pull_up_program9r79x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fe292c2c7d7c.pdfIn PDF document text
    • http://bluetea.space/how_much_does_it_cost_to_service_a_stairlifteyo3l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didewuwu.epizy.com/62362136056.pdfIn PDF document text
    • http://reluwiz.epizy.com/81012595731.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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 5240 bytes
SHA-256: 1e9c35bbca4b994910060362f35aedb48c28c29e8574b7d2edfceed54aca2ea4
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 11928 bytes
SHA-256: 0b2c6a1cd617a4fd768ef2a5ed12d8b6a3a8281e5e26e80a8e5ea7119b1c2193

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