Malicious PDF — malware analysis report

Static analysis result for SHA-256 582bb4ac08171b2c…

MALICIOUS

PDF

86.1 KB Created: 2021-01-21 20:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ada9b1476071839d615d47658ecf8f7e SHA-1: f35ef9bf48f543dcc433ccf12d7bde6d6a140f52 SHA-256: 582bb4ac08171b2cf09649477679acfac80ffd712a7f3865f5a797ca050f22da
174 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link that points to known malicious infrastructure. The embedded URL is designed to trick users into believing they are interacting with Instagram support, likely leading to a phishing or malware download site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/wb?keyword=instagram%20report%20problem%20text In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fc7471469d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5fd8d9f8e3ab3.pdfIn PDF document text
    • https://site-1252467.mozfiles.com/files/1252467/synonym_antonym_apps_for.pdfIn PDF document text
    • http://zepawagir.iblogger.org/rupekalolodizomev.pdfIn PDF document text
    • https://site-1250347.mozfiles.com/files/1250347/kolusatojazediroz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381532/normal_5fcdddd00e276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ff0edce502b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_60004d2791d70.pdfIn PDF document text
    • https://site-1172169.mozfiles.com/files/1172169/dog_simulator_codes_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fcf671124d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5ff5e66eadbf0.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/i8Zgehb/2d_stacked_stl_file.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijifosunusu.epizy.com/bts_fake_love_full_song_free.pdfIn PDF document text
    • http://regujivabi.rf.gd/21333035089.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_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 5284 bytes
SHA-256: e68ea6f1ca9f14a348e3cb323e0285f6798b3f986b3dfaaab2b613b6b26c7437
font_01_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 11548 bytes
SHA-256: 92cedd5566aa316e17c9a4e95033a80c8c2f3de6dbab47ebb0b0dce095b29d54

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