Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0eca92fa66470e3…

MALICIOUS

PDF

91.3 KB Created: 2021-04-15 14:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6af68b812dc08b6b31dbaebc46b9df2a SHA-1: 550b7612b0ed40d20976a2b138cc427067c53c24 SHA-256: e0eca92fa66470e35808dcef24ede48bdcb066ca406b8699a8f89fa9b1f1a1a2
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 0.9967

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://midufefew.ru/strik?utm_term=games+strategies+and+decision+making+2nd+edition+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5fe1a545d065c.pdfIn PDF document text
    • http://lestyprin.online/passat_1.8_tsi_vs_2.0_fsi7ou0k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_604f2b698c612.pdfIn PDF document text
    • http://fashion-deals.xyz/melhor_curso_de_marketing_digital_para_iniciantesbemph.pdfIn PDF document text
    • http://mexicotop.xyz/shodhganga_mathematics_projectv2k6z.pdfIn PDF document text
    • http://power-guard.shop/531254266369dnzd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_6020ffc823af3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_601536badcad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_6015f0dd56a22.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/kabisebax/vojoredatetubiledipukilop.pdfIn PDF document text
    • http://xomexopiguv.rf.gd/wow_vanilla_first_aid_leveling_guide.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_01cee842d91f429394eb40a6fd640800.pdf?index=trueIn PDF document text
    • http://zexenodu.rf.gd/16380186009.pdfIn PDF document text
    • http://repikigerudu.rf.gd/fuzuxubim.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/8183991394.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/fekuvorumola.pdfIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_65ab5656b57e40e69979dfa5c82a21cd.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_2839a58761d44b05b33336858e6267aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/53223776635.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_680d05734d1548829fd367560e491491.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_104a19196e174e5ca36575a01f682105.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_fdd1c5781d6c474991498f6b698d7ba1.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_9b46378f948442c9a533dc8302602e34.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_9b4c6a587f3446aab4ecdd117852a658.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_4b4981cf9c0549f28afcdb75bcd79ee1.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_0508847862bb4f1fbd9887e43eb0f501.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_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 5668 bytes
SHA-256: ef1b68a9d94f756a7a7db5de5b8f675099d453690752c195ee459d441e8e5ca4
font_01_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 11272 bytes
SHA-256: d0b0272c3ccfa1a469430d2b37cbb9c9895254e4818be84d58bd22571137e1a8