Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7cf7db4a2459c2…

MALICIOUS

PDF

113.6 KB Created: 2021-04-02 01:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 90b83dacbc98d0e3cdb148250d0a9c47 SHA-1: 5b8b47822c313f4e168a2504c38faa920c2e17d5 SHA-256: cf7cf7db4a2459c279118f657a646d8ff9e2106fe2c36254ea51e0195647a9e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://resalured.ru/wix?keyword=dic+color+guide', is likely used for phishing or to host further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • 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/wix?keyword=dic+color+guide PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_36fd41240ead414e804f78c29dd81600.pdf?index=trueIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_41cd3b29afa54ee887463c7026604732.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_19e722ba82f94a6288db37cedcd14476.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/reliponizilidu.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/dowukegiriluwuloxonipisez.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_f2839aab28c0453083f7bac51035305a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/sapizifepiz.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_2d0c47473fe441479d5a386848ce5418.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_484cf0fcde27407db412253a37f96199.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_000707d02af84bffa98efc43f5318843.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_0d4e403275154d6b9f93ad6feb274e16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/game_archery_mod_apk_revdl.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_01d6f233ff274024b3a66082ed54c8c0.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_4dd360559bcc423bb405e63521ffe77c.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_839153087517453ab2b32a4901bda08b.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_56b4cc227cf84c1c97027344429014c3.pdf?index=trueIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_590106b1cb9346d783c99d76047e85e6.pdf?index=trueIn PDF document text
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_48ec4688d8994e1397f766412dc55722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/37914125082.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/banner_creation_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/nodeguratasuwavik.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_7e178acb53ce4f47844095721ed0c412.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_off00016044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16044 3896 bytes
SHA-256: 1698a5df6cce6d4d519afea73cae2d377807956bc3fe7805ad924111c30dd31a
font_01_sfnt_off00016e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E30 4716 bytes
SHA-256: 5da00fd730ff9301c3fd535637197ec741eadf75bf2cd5c038c7d1f9e10c3569
font_02_sfnt_off00017e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4B 10236 bytes
SHA-256: b142987fa51b4d32b8d9a30735326d1253031ff29fac7d358c80a02f564f8df3
font_03_sfnt_off0001a1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B5 16076 bytes
SHA-256: b67cbb8e18f25db78dc5224b2fcadc330409e4987dee2a84b3505743999eb4ec

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