Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acefc9f6f758465…

MALICIOUS

PDF

85.6 KB Created: 2021-02-26 14:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fb0e9cf6b72d50e488b6a14b0a649356 SHA-1: 46810f26c6470d281b57db384dcca6dc785ef84c SHA-256: 0acefc9f6f758465fd324122f53d5b4602b3e082202781a251c8e3bbc02219c8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics further supports this, as the document likely serves as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/123?utm_term=macbeth+act+1+scene+2+translation PDF link annotation
    • http://roskycnmx.com/segment_routingsvcmm.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/zudovajej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_60199d669b3bb.pdfIn PDF document text
    • http://fonagifegelu.iblogger.org/vikefukenovuzadewejumixad.pdfIn PDF document text
    • https://zumokijux.weebly.com/uploads/1/3/5/9/135966910/beb924fd.pdfIn PDF document text
    • https://niresofet.weebly.com/uploads/1/3/2/6/132682193/d613cb95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_603871b41f1cc.pdfIn PDF document text
    • http://desokore.medianewsonline.com/8918805237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529281/normal_5fc6fc840848f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60233ade4d49b.pdfIn PDF document text
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/pefude.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/dojivewobasuval/puvagelafep.pdfIn PDF document text
    • http://rirazito.epizy.com/printable_handwriting_sheets_for_second_grade.pdfIn PDF document text
    • http://wubalele.rf.gd/42037689885.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/doa_sesudah_membaca_surat_yasin.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/ruger_sr22_ammo_problems.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_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 3608 bytes
SHA-256: 2f0b9aa6ba9c6795692e9f77367736a9a64ca909405d9648219a44097f4a3d22
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 5216 bytes
SHA-256: 10b0604d9706292034cd5ee77970838db0a9f5d5fa04309f4d3e5301c84ecd5f
font_02_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 10668 bytes
SHA-256: f012d0e9d95e3c0d1e4eca25b4e24f9bdd313aea57eb38dd392c8e390e73146a

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