Malicious PDF — malware analysis report

Static analysis result for SHA-256 5054f79927419058…

MALICIOUS

PDF

77.3 KB Created: 2020-11-20 17:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a0a9253b2d49163edf8d40e4e1bcd5ac SHA-1: 1d0d5c088959538429dc3e2c3b091542b21710de SHA-256: 5054f799274190583c39a1734ca8cca8712969bc26e7eb0897ec29343453ef05
214 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Aplicativos legais para celular android' (Legal apps for Android mobile). This indicates the file is designed to direct users to potentially harmful websites, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=aplicativos+legais+para+celular+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5fa93cedb3f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fad3b586aff9.pdfIn PDF document text
    • https://pinuzika.weebly.com/uploads/1/3/4/6/134640149/kuveruk.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/8510616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f8b3e6bdcf46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_5f949b63df0a8.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f894eedec865.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/167faf1d-fcd9-4575-9d64-c7843877ff7d/birojigidox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8872b277-5906-4ce4-811f-3e26eda22ea7/79058302114.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/pagopomox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79756d2-0acc-4a0d-afb6-681f93d84f3f/32894135543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ad4993-5cd3-4351-9d85-b674583abbfd/josh_kwondike_vine.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_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 5288 bytes
SHA-256: 91b05be6102ae921986e5a9765e44e7e53e165d991c8844803db30eecef73d31
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 13248 bytes
SHA-256: ca140ddf38c8076fdef2a956d5bae9e74006f68348bfc32b51eda901b2286f99

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