Malicious PDF — malware analysis report

Static analysis result for SHA-256 854e458caee8724c…

MALICIOUS

PDF

87.8 KB Created: 2021-04-03 11:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9f69f0a453b3938b494e6767c5f40dbc SHA-1: c3bad444c1b46e53d96e444f15db774c210c03df SHA-256: 854e458caee8724cdc4ce7f2c7493753e2d6d9b9486e582a6dfc65498df2d80a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with the primary URL pointing to a domain associated with phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://nipisod.ru/award?keyword=keto+diet+plan+for+beginners+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5fc8e7307ba74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_60420359b0e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_600cf00f7ec4d.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jcqsifp/xozerabi.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/risavifobafaxifuveg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_600c3cfc212c8.pdfIn PDF document text
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/5821890.pdfIn PDF document text
    • https://cdn.sqhk.co/zedujunuwuxe/jtEY1gc/gojudavobozege.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/aiajagj/64097360762.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/wusone/graphing_cubic_functions_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/sanaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/battlefield_3_serial_key_generator.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_30353c378b394f73866b9e38fa14412c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firudegix/woxesunam.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_749af20e18254fee9f64f7f0a2e041c5.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_c19f17cb9aa04e828e0fc5ddade92d57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/56344013746.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_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 5316 bytes
SHA-256: fa6ddb7b0c710f43f7bf37f998814e3f5786fa762f364216fe1b00c4375bc223
font_01_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 11688 bytes
SHA-256: 401ed4483230e43e7635c525a513b95bcfb9f23b027b6d1ce2604dd0dcc71e4f

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