Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fec61c813c4c8b…

MALICIOUS

PDF

124.5 KB Created: 2021-03-28 10:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4b5cd310972ffc9aa342ec0ca1917528 SHA-1: d612a77bbb7d02bbf56d6c66809959949bbd3642 SHA-256: 19fec61c813c4c8bc904982d6704b9cc5bc43417ea5bb8ac1155be864586c20a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/123?utm_term=bleach+original+soundtrack+4 PDF link annotation
    • http://fedemofutig.22web.org/67895502323.pdfIn PDF document text
    • http://jokaxamilobizal.22web.org/clarion_cz302_bluetooth_pair_list_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_600ffbc96ddb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5fc6fe918b48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_6040fa178639f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_601b42f022ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_604d0bfd8a42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_604f2e27b2a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_601f74ab76385.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_6008363240211.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/dutimajizowa/42100568479.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_97ecd1f6c40f4b3b89d6dcfedb487390.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_3880f03103a44186b6a46018ba54b3b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/zidamiroxowiduzilogapigor.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_b9d6aa2f54e24b178a906567256c864c.pdf?index=trueIn PDF document text
    • http://niribulikebi.rf.gd/11975340755.pdfIn PDF document text
    • http://gidigeja.rf.gd/john_deere_hpx_gator_cab.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_22ee2c8099f445399f980f0236fb8d66.pdf?index=trueIn PDF document text
    • http://wefuzage.epizy.com/55129171149.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_ac5504ab6560425489ab00e5f5f36db7.pdf?index=trueIn PDF document text
    • http://dinexun.epizy.com/jolarazatiwapesifu.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_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 40820 bytes
SHA-256: f02844163c66822dacac9dc486558dd3aa0357dd1783999187250a5fad93b493
font_01_sfnt_off0001a97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A97D 5404 bytes
SHA-256: 542ca2de6ec7d6ceca9a4c777647e0c53b438744cadb6b619df75ed78c813d64
font_02_sfnt_off0001bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBD9 11688 bytes
SHA-256: 5e65e3674a8c1bf5b3028fa44896b7509ddbf8dba34d4c22fbadfe08f6f870be

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