Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1734b8799c3912…

MALICIOUS

PDF

74.9 KB Created: 2021-04-18 12:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a4d543629612ae4fedf950bd1613efdd SHA-1: 5176d9cd4dfb754e236ea6a4c5f23026339d0fda SHA-256: 7f1734b8799c39128f075165a3475489e4d045b5d2fac72d619304db5ee5c69b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://jacksth.ru/strik?utm_term=how+to+shade+a+portrait PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5fc9dfcde6a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_603f3424c7c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_605f56bec3e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_60464e85e713e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_604e726e4ad59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fe02dcf8795d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_605892833d649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_600bab88a550d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6011e5d66e654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_6055f006ad0cf.pdfIn PDF document text
    • https://refanise.weebly.com/uploads/1/3/5/3/135389799/5c3c36cf.pdfIn PDF document text
    • https://tazowodogakog.weebly.com/uploads/1/3/1/4/131437711/biwudedugazijija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_60098baf7ce26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5fc72b3416c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_602c03eca34b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493549/normal_5fd9fcefedf86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_601b6497634df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_604d777f4c39b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5feb7b21bd982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6059b54fc0cdd.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/bujugag.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/0c22d012-6abc-4f45-bf62-2c41b8e8da87/89002386266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804f96b1-88e1-4a03-8643-70c74bf301d1/2020_toyota_camry_se_awd_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca19514-d37f-4499-a753-e7810829d1f7/bodas_de_sangre_personajes_el_novio.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5068 bytes
SHA-256: 0c2cd86e2a1564a2de696157d1f0de5c618e31a8ea324f4a7ba758c8cadf0193
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10992 bytes
SHA-256: 9a797c3ce47d32b6f91dd0cf726105ee4589d1fc6fb7693518581fd58dc787ae

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