Malicious PDF — malware analysis report

Static analysis result for SHA-256 4250033664b762fb…

MALICIOUS

PDF

71.8 KB Created: 2021-01-16 22:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5ed5c4a952cd4f70632d127994b677f6 SHA-1: dc0c683ca7b33a84c3e699e9d5ee3d06ca8d1167 SHA-256: 4250033664b762fb45900295570f80643f9d2cd1007cc71ae6c48e3b21d8f1e3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?utm_term=rugby+drinking+songs In PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/7a763eb.pdfIn PDF document text
    • https://site-1173507.mozfiles.com/files/1173507/exodus_crypto_bitcoin_wallet.pdfIn PDF document text
    • https://site-1168170.mozfiles.com/files/1168170/wekawivawalitavatexi.pdfIn PDF document text
    • https://site-1178186.mozfiles.com/files/1178186/2015_chevy_trax_ltz_owners_manual.pdfIn PDF document text
    • https://site-1172047.mozfiles.com/files/1172047/fizabujewutugenoxiza.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/gsHhbhd/90630264935.pdfIn PDF document text
    • https://site-1218501.mozfiles.com/files/1218501/74857978913.pdfIn PDF document text
    • https://site-1230941.mozfiles.com/files/1230941/tutugepowimevelefepin.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/rKt41ia/stickman_tennis_career.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/61419452177.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/jygfPgf/shaq_fu_a_legend_reborn_review_ign.pdfIn PDF document text
    • https://site-1083549.mozfiles.com/files/1083549/school_management_system_web_application_in_java.pdfIn PDF document text
    • https://jugevenow.weebly.com/uploads/1/3/4/7/134736768/pavofuzo.pdfIn PDF document text
    • https://site-1176409.mozfiles.com/files/1176409/bolupuguzomunuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/nogaluma.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/pigikipumikisisalapudov.pdfIn PDF document text
    • https://medlineplus.gov/recipes/drinks/In 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 5064 bytes
SHA-256: 71477f0832e1067c737f61b2a425c2316db5a613e81a9fcdba1e5fce711393a7
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 10628 bytes
SHA-256: 286ece78807d0059438f8dca6a70c861d345f99ed1caee769daf059ce65bca78

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