Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44d22b96c0eb808…

MALICIOUS

PDF

101.7 KB Created: 2021-04-03 21:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a994782e11cbe494916ab80fbe89a57c SHA-1: 1cbedeb0d515ce6bc62037462f9d128a751dc65b SHA-256: f44d22b96c0eb808da9e89dca93b18198db843ecc99da03ca93358e8bd98bc2c
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 0.9998

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://gimoguvi.ru/123?utm_term=secondary+school+staff+handbook+template PDF link annotation
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/xazomi.pdfIn PDF document text
    • http://svoytrylend.xyz/126977712836l9h4.pdfIn PDF document text
    • http://aydym.club/spay_and_neuter_clinic_near_me_frees8pig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602000ed174f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_6042d09f2aa2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_603d38728649e.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/jebavukifi_rofexotixe_rebufonuvomuzuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_603398ff22e6c.pdfIn PDF document text
    • http://kyukty68.xyz/901442527389lya0.pdfIn PDF document text
    • http://digitalmicroteter.xyz/voynich_manuscript_decoded52xfe.pdfIn PDF document text
    • http://proba7.xyz/6446849300tg7cy.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/fotepopunaj/falol.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/3331733955.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/time_connectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/garment_costing_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/53507689180.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/96069307824.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/lulowezakuju.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_off00014c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7F 5804 bytes
SHA-256: d16db094c632388348429a581415847f96ddc2905e58004924a2f9f1720dbb8e
font_01_sfnt_off00016022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16022 11884 bytes
SHA-256: 1adab19ab7a9104ef022be06d6ab1e97a372debcd9b74e2d5cc6622d797b905e

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