Malicious PDF — malware analysis report

Static analysis result for SHA-256 798430302f9fb3c1…

MALICIOUS

PDF

79.2 KB Created: 2021-04-17 14:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c230eb00c5dcfd2a38e295f3397c2d42 SHA-1: e0eef2aa1d14b2d0f629ff0becfeaa9842d74422 SHA-256: 798430302f9fb3c12f48bb75fb7e4800f98cc9d3749e2476b95f200beefbd85f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=2018+ap+calc+ab+frq+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457854/normal_5ff31698389aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_606e51069d3df.pdfIn PDF document text
    • https://vuzizakepavojen.weebly.com/uploads/1/3/1/4/131484090/gabiwurak-sokozolewav-pigevogalur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377656/normal_5fc9170b7c999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6046261039499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_6014c1a481ee0.pdfIn PDF document text
    • http://azorocheat6.xyz/sagimapabefurokaxijodonie7krj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418791/normal_5ffe702885aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_603f76d8bf16a.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/penepokunodu-votewedilesemo-lokagase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5fe24dd1d4803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_602a13435d9e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6062c8c2f2873.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/subozifijejoropajuvi.pdfIn PDF document text
    • http://itwow.info/formation_continue_bibliothcaire_documentalistef5kie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_60465c00ae32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_6022d04a1d601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_c2eba2c46d9446ada55be18edbee3d00.pdf?index=trueIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_f751259df3d74e4f9687b78ceab636a3.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_5cc3bd399e5444fabcae5d1211a150c3.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_53163145752c4595a1cf3ec8dc78bcd8.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_3df6495fe3444fc490445fea1c2b166b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5688 bytes
SHA-256: 487ce1e60b66a085b64c3ca221fb77d34e27789ad40d5e7584adb27d72bff11d
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 13236 bytes
SHA-256: 64c800d44f534bbbf165501a4c353310c9e6d15e144efd7dc9379c26953709ed