Malicious PDF — malware analysis report

Static analysis result for SHA-256 c152bd29dc3ba272…

MALICIOUS

PDF

75.6 KB Created: 2021-04-02 00:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6a446f8f3da683cc44f21ac7d1e05136 SHA-1: 11625a9c1e0d41752db774df21ba7dce0f363d0f SHA-256: c152bd29dc3ba27290d6e4f7c5e6de2554697d15dbce906b7596b79edeb44e1f
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 0.9997

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/aws?utm_term=how+to+know+if+a+compound+is+paramagnetic+or+diamagnetic PDF link annotation
    • https://cdn.sqhk.co/dedizajo/hNThduO/download_real_stickman_miami_mafia_crime_mod_apk.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/80597012266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_60038f9a6029a.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/ehcheqm/wutedudafusipopezejapegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5fe26f89a77f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_604de30498f2a.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/algebraic_expressions_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefotebe/giifshb/xawamakixezituxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ea2360725a1e4657bead5fa4813ea173.pdf?index=trueIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_20cf86f862ba4b1786b38a06191da126.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/63162368786.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_33d13c13fe424620b72bd47d334eb0d4.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_cc68c8ebdce544f3b79a9ed9e1e60adf.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_04814a749bec44b2b925418a34937147.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/26282875402.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/fukujejagozesugoxaj.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_0035ea5552434bac88b84700893f67dd.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_7017d43e281841f8b4712e659b9433be.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_bd2704f1e3424760a54a00be90243316.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/health_economics_definition_simple.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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 5560 bytes
SHA-256: 12e65bbceffaa21aca1d8d4f89b14c9e4b76a0895dca5b624b98be2c0d22d097
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 11136 bytes
SHA-256: afe6db26e574172dd7bef404a8d53db6db7ef97febda46c8dc490743fe9e9ac5