Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a26a36a120f4019…

MALICIOUS

PDF

67.2 KB Created: 2020-11-14 03:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fd8118c7d44743bb26629d232022a49b SHA-1: 4e363f79cf93587b97bded2bb8b5df70fdee3599 SHA-256: 1a26a36a120f4019b6a7b1cc6904efef4d6999c6d85067f20a68e80f38b05179
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to contain text related to an essay title, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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://traffine.ru/123?utm_term=ap+lang+the+company+man+essay In PDF document text
    • https://kipidabivipili.weebly.com/uploads/1/3/4/3/134340994/46f217e89.pdfIn PDF document text
    • https://vobinuxidixuf.weebly.com/uploads/1/3/4/4/134471365/zexuxasib_lezonopiw.pdfIn PDF document text
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/ff613407c0bc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/591a046c-a7de-479a-b94e-297dc7ce9310/67198048372.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/99066938365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70296fea-e434-4a10-8c74-d07c6678b33b/content_aware_fill_after_effects_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40dfcddd-221f-4b95-b5b0-40d4bf80c807/kurir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb05a21-355c-489a-aa18-66c87269fe7b/94195371248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7474419-2749-40d2-a9db-858f2079e6b1/bexagezemam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944db291-63da-405f-9f79-b17534426595/83454420169.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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 5340 bytes
SHA-256: 6175eb62519674df12bf0511e69cec28ce23b3ed9442a90d39c777633b349539
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 10364 bytes
SHA-256: 1717ecd95d8030a59e79191658f17d497ebb47748a90aac84610055f433fc38b