Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eb88bc56f7f738…

MALICIOUS

PDF

100.6 KB Created: 2021-03-25 00:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e8d9e11c0034c35e42d3c46e2b5d8030 SHA-1: 355833c25bfd506e2b073167a10642df894de376 SHA-256: f1eb88bc56f7f738add7c56d44e66883e78c38539fd15b12ee8deacd353afca5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URL 'https://jottigo.ru/strik?utm_term=a+clash+of+kings+pdf' further supports the lure of a document related to 'A clash of kings' to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=a+clash+of+kings+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fe7557b808aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fe8fabccd064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_600f4ca0928d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_605bbea80c03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_60383f7c4d34b.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/6424383.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/bc349352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6010a5e282078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462035/normal_5fe78dddd3721.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/1177744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fcae6b6359f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_5fdae0e4a3b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_60535cfb0160d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_6009f808239d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6048fb8d0d2aa.pdfIn PDF document text
    • https://lowezikalazana.weebly.com/uploads/1/3/0/9/130969016/ginijurimide_nipemen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5ffcded9468aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fc870bc9bbef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_603837a45668f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_03f917e2ebd34b00aade4bfc3f4144fb.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_4bd96ed0f8554103817f697bcd9244a1.pdf?index=trueIn PDF document text
    • https://f511fae9-839b-4dc4-b9fe-2e6f1305d388.filesusr.com/ugd/c4dbd3_6fe26b5b30fe4cd99eb8ed8b939f44a3.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_206778dd7c2e4e31adeacf1809905953.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_e02623b8533c48899f2013ea57353fed.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_a0a4c430905f42689e48894353d1fd67.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 8148 bytes
SHA-256: c49d79c09d48d4f9cb8b9e2e0a89b1731ef8169fed5c3a89d6c8c175d5154fa6
font_01_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 5376 bytes
SHA-256: c70b421e316eeaeba4d6b2813215d19988fd53551e17de8f022781ebd23d981b
font_02_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 16984 bytes
SHA-256: d10d95b6b5839448c55bd23c83fb13f29233a3dcd431342abc615398bcc5ac88
font_03_sfnt_off00016bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD4 17024 bytes
SHA-256: 2819b334c2e6eba9d6f1c89bc0cdeec49c74f020d93dd1378440906ca03eeebb

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