Malicious PDF — malware analysis report

Static analysis result for SHA-256 18af06f2c9f94340…

MALICIOUS

PDF

87.8 KB Created: 2021-05-16 15:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8963fc1403f25c8693a9c43af14de49 SHA-1: 2ea56842101de4f1c262674aeeff435fe6c62559 SHA-256: 18af06f2c9f94340f4a3ba49711a1522baadf5eca2bf3571cb86d5ee6c7e8906
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to manipulate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+are+the+examples+of+embedded+systems
    • https://cdn-cms.f-static.net/uploads/4485828/normal_6044e0648a586.pdf
    • https://cdn-cms.f-static.net/uploads/4420766/normal_606d93d43fc8f.pdf
    • http://xuxazawuti.22web.org/54579873011.pdf
    • https://static.s123-cdn-static.com/uploads/4387924/normal_5ff32adb41c46.pdf
    • https://cdn-cms.f-static.net/uploads/4459482/normal_603a505be2cd1.pdf
    • http://gejepixaso.iblogger.org/biometry_sokal.pdf
    • http://lozejebivo.scienceontheweb.net/pemivo.pdf
    • http://gemajelibetojup.scienceontheweb.net/9066419743.pdf
    • https://cdn-cms.f-static.net/uploads/4379477/normal_606d28d2ac79f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tunenijexe/duwiwe.pdf
    • https://s3.amazonaws.com/kawotexulozax/probation_reporting_by_phone.pdf
    • https://s3.amazonaws.com/tobito/47072111457.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_be278ce6de474964a24e360eb31112c0.pdf?index=true
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_dceb62fd91b3464ea283c9a3234a7e6d.pdf?index=true
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_bd05e71e4a8e44ccb2071d1238c2be3c.pdf?index=true
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_87a43e60bc9240129b8e4babc42c5e5c.pdf?index=true
    • https://s3.amazonaws.com/fadedosi/12248540360.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_6a5177003762438bb413599b497ae0c7.pdf?index=true
    • https://s3.amazonaws.com/vezumobigodub/charge_off_definition_credit_report.pdf
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_cefe1c5f8d5344f49f1304930a4a2528.pdf?index=true
    • http://fukokikedusej.epizy.com/jebiwazodimupesewagov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117dd.bin
338ea4e685a091c5bf348dd2e9dc4ac4d4b98421347f7fc46d2e9a7f8ee89459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 5604 bytes
font_01_sfnt_off00012ad0.bin
b83a619c1138d6aa6b3b3e8dc9a4c102402c278177369e395d3d535f86176a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 11616 bytes

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