Malicious PDF — malware analysis report

Static analysis result for SHA-256 42749c5c255c4603…

MALICIOUS

PDF

190.4 KB Created: 2021-06-08 13:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bb68ea7909e266442a99891819f9db4 SHA-1: 27869b0fc935df0b7aff9a030586974fb3b59bcd SHA-256: 42749c5c255c460367e9171aa766afe00530e2a89d76e97b825f494e8821b7e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9971

Heuristics 5

  • 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 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://cructi.ru/pbw?utm_term=how+to+check+covid-19+test+report+online+in+west+bengal PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4448100/normal_60b79716d9e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_601b38ce1c739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5ff160364435a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409614/normal_5ffe0964b392c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_6052dd944538d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_6005367ca1a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_601eec9f8e51c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454694/normal_60036fc6bc663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_600b5b526483e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_603ba78756010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_6044f5c3455b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd968ef-d522-48fd-892d-37c464ec8fd5/fafiwipita.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/subject_verb_agreement_worksheets_intermediate.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/revivir_huawei_p8_lite_android_6_flashear_ale-l23.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/duruwikojofita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450ce929-15c4-4e44-8890-bee587900514/jufiginenepunon.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/w/file/fetch/144801327/91041098264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d836ff-c974-4fad-9b2e-6216751d952c/8083553484.pdfIn PDF document text
    • http://bisixakab.pbworks.com/w/file/fetch/144835452/transformations_dilation_worksheet.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144505386/dakadivan.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412008/abstract_painting_concepts_and_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6774d6-f60e-45db-b6ff-4c56c1f2be8e/34004697178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f60256-c045-4e76-8032-449dc26e8eeb/kesumamotomunexidodalo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002bea7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BEA7 25232 bytes
SHA-256: 601c8724ac58ea32d130dd34b1720604733a477727513f9a5bb8ecda4ca611c4
font_00_sfnt_off00027fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FC4 5892 bytes
SHA-256: 080233dfae083c18e262c30ae00a9c189eb5b9779d3cec3f64db2251967edf20
font_01_sfnt_off000293e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293E1 13572 bytes
SHA-256: 765486b5bce6b7bb9a0bb26ff92365389af2be6ec6bff4bceb171e44f16b93ed