Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5511cf76ed7432…

MALICIOUS

PDF

73.6 KB Created: 2021-01-21 03:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 23b8c10a53d59463a6e0576e1f00055a SHA-1: dc330762c717e972c532166416146560214c4cd9 SHA-256: 5b5511cf76ed7432dfa7012755e80c2077e57918da2b834a6519750f2b17d4e4
222 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing, pointing to 'cctraff.ru', suggests the document is designed to redirect users to a malicious site. The SE_INVOICE_LURE and SE_PASSWORD_ARCHIVE_LURE heuristics further support the attack pattern of using deceptive content to trick users into interacting with malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cctraff.ru/123?utm_term=lake+oswego+parks+and+recreation+classes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fb2e3e7c39f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5ff1f3f813d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fbc0c669347d.pdfIn PDF document text
    • http://maxitis.22web.org/maven_failsafe_plugin_report_directory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fed94d2da4c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5ff5b54ca4e7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5ffd075492099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465564/normal_6005dae2b3586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f9207d0eadab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5f998e3eb448a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fugewad.rf.gd/69939204829.pdfIn PDF document text
    • http://waxaravibew.epizy.com/roromabinogulunineto.pdfIn PDF document text
    • http://vekamujibatebig.rf.gd/blitzing_biology_11_answers.pdfIn PDF document text
    • http://pudekixepubaz.epizy.com/juxotepiziligivekowiwudiz.pdfIn PDF document text
    • http://nareboveridur.epizy.com/54815900601.pdfIn PDF document text
    • http://kifarir.rf.gd/wofositesawufebozaji.pdfIn PDF document text
    • http://ziboporo.epizy.com/62348583208.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/formacion_de_enlaces_quimicos.pdfIn PDF document text
    • http://tafujeloraxofo.epizy.com/96307421592.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 5128 bytes
SHA-256: b4faf7720a11b253ac8018466c48642fb93733c7d43f00dbe6408b6a36a874c6
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 10248 bytes
SHA-256: 4f4a1f42c30c1eac55c9b2f953b701fdd22408cd244b81d3c577ec6236ba5849
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f