Malicious PDF — malware analysis report

Static analysis result for SHA-256 511318ae11c78575…

MALICIOUS

PDF

65.4 KB Created: 2021-01-11 10:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3c79a095662482f39d323ff4d0d60188 SHA-1: b98df18bf7a7b6a5612f106a72cf0464a54867c1 SHA-256: 511318ae11c7857588721ea261383a807b2ea361fd90ecf44befab09da5a298a
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL, https://traffmen.ru/123?utm_term=solving+inequalities+worksheet+doc, is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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://traffmen.ru/123?utm_term=solving+inequalities+worksheet+doc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5fd11c5a530aa.pdfIn PDF document text
    • https://site-1172855.mozfiles.com/files/1172855/business_intelligence_analyst_skill_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_5fdaf259283f9.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/word_rings_2_level_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5fd68d0a8240b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f890fc14eb0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5ff01eecbe70b.pdfIn PDF document text
    • https://site-1172017.mozfiles.com/files/1172017/my_boy_emulator_pokemon_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379612/normal_5ff2819501a02.pdfIn PDF document text
    • https://site-1178650.mozfiles.com/files/1178650/followers_on_instagram_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5f9657205ec6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fb73981cb202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA3 5648 bytes
SHA-256: d2308465eacc6e4c0521f4f28a4584a529c5cee4128ad80a293d025401f38cc4
font_01_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 11488 bytes
SHA-256: faf312f1d8163fcecf082bb64ea667a643a1e1ef8ec278d5f1f934ce19e8967c

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