Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62b1692d9e2fd86…

MALICIOUS

PDF

67.0 KB Created: 2021-03-21 07:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f908f587b0f543b588395cdb6bd3a81a SHA-1: 087f4efe1c5cdfd07b2602e5c072f7a5e18c2996 SHA-256: f62b1692d9e2fd861a928445a0a12db992d9aa833175e9863661dfed3d7083ae
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be a lure related to an engineering textbook solution manual, suggesting a phishing or scam attempt.

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
  • 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://crophysi.ru/wix?keyword=engineering+mechanics+dynamics+14th+edition+solution+manual+pdf In PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/87d30fa3.pdfIn PDF document text
    • http://copyright-infringement.business/563313282ip8wy.pdfIn PDF document text
    • http://petrol-v-pol-price.site/nombres_y_ttulos_de_jess_en_el_antiguo_testamento101vn.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/8297884.pdfIn PDF document text
    • http://gloslides.com/mogopapebyanw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_60418be17001a.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/be830340f3.pdfIn PDF document text
    • http://vereffka.xyz/19420107118b4jtj.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/titan_440i_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5ff28f42af72f.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/libusamagowuvo/9940215514.pdfIn PDF document text
    • http://tamupevex.rf.gd/revision_worksheets_for_kg2.pdfIn PDF document text
    • http://nixedorufimidax.rf.gd/foramsulfuron_data_sheet.pdfIn PDF document text
    • http://buzanone.epizy.com/darobuxarewezabat.pdfIn PDF document text
    • http://pavinudoj.epizy.com/13427029009.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/44163860038.pdfIn PDF document text
    • http://kuwubuvorij.rf.gd/13368510846.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 5768 bytes
SHA-256: 56cf87c21f1b07ef123eacd38639545169035e1d1202aa7feece7a7af47d2034
font_01_sfnt_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 10552 bytes
SHA-256: 1cb10c1aa3a9d2288b4474e63b656d1a2d83e44e9dc06ddcc6b83ac62a973935

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