Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e37f6c0150e114…

MALICIOUS

PDF

88.3 KB Created: 2021-06-05 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ad6830d36ac8d9b85445f5a0ad967942 SHA-1: 25335202c65f286d96e1bf44a3310e499a48f47a SHA-256: 98e37f6c0150e114292c1326dc69d390c0e1065edcc0b6bd24d2f24270d905ef
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 0.9989

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://botokaw.ru/123?utm_term=angular+6+site+templates+free PDF link annotation
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/cfe299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60300e2f3f032.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/4379348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5fdce09aae1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_60601e953b80d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fdf9e2cf2294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_6018111a38734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5fcabdd9ed348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_60225cab98e35.pdfIn PDF document text
    • https://jevuzukolusiwu.weebly.com/uploads/1/3/0/7/130739503/3a288a118.pdfIn PDF document text
    • https://dugepenen.weebly.com/uploads/1/3/1/3/131379306/wulefifibuje_kumisutinefale_vonojanobabam.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/muput.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/75bfa5a41688f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6053a52528eea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_6002c24daeba2.pdfIn PDF document text
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/dafuma-lunake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_6039b196b303d.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/jimetuzinug.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/rutafirunod-bosikan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fea432a4cc60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_6028fbc3387d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_602f4882a233d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf943bdef3f.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/a18182e4f3264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 5364 bytes
SHA-256: 079bbeb804753841effda597bc0769d75973c3b502a206734343f3d155a186fb
font_01_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 11052 bytes
SHA-256: 06ce75939bcf45075162e83d19979b52eb1e1191928548d644e4f25b1a4f0814
font_02_sfnt_off00013de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE6 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443