Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1fbdf4ec7bb379…

MALICIOUS

PDF

88.4 KB Created: 2021-01-21 15:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 855b96e11b1ea6555eb40b56af193820 SHA-1: d2eed0b930136ae482ceb8cbb9a04ad764a2716a SHA-256: 4d1fbdf4ec7bb3793411bf4ff6493fb7b95dba7106f3d7a9351639aca8c8241a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=guide+spyro+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fc74b90da3f9.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/zasezugodojuri_sasetagefex.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/katukiniwotipivuxir.pdfIn PDF document text
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/wutorujigomebiromure.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/jexad_ditame.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/wezaxenetife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fe65814e4303.pdfIn PDF document text
    • https://jizesemud.weebly.com/uploads/1/3/2/7/132710762/pipus.pdfIn PDF document text
    • https://susuwiwonilo.weebly.com/uploads/1/3/1/6/131606006/xedire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426941/normal_5fce2f249cb47.pdfIn PDF document text
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/2536064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nenutufap.epizy.com/welizef.pdfIn PDF document text
    • http://xokesuluz.epizy.com/buzes.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/trucos_para_eliminar_hormigas_de_forma_natural.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/base_form_definition_and_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/nilupopiwanoxoxejapopik.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/panasonic_aw-_he40hw.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/pedivap.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/matrices_problems_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 4704 bytes
SHA-256: 760922d0da30a3d067ead02d561fdaa2e0dc8d5f91b5c31e3d2afc34b15bcf6d
font_01_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 10552 bytes
SHA-256: 70d94fbaf51f14c39ffed43fb97dbf2632d57ed92c92d9e92d5c11b2dba38c4c
font_02_sfnt_off00014666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14666 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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