Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5adc00f10f5971…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 14:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b82aad86ea505f98239ca6c8a6f62462 SHA-1: 998b62f88248f788f5dcb1a5818eeb99f30a88d5 SHA-256: 6e5adc00f10f597187d1975f22e6c4ba4ead613df1210edc79ad3fc47fa24fd1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=foodsaver+v4440+review PDF link annotation
    • http://xubajur.mygamesonline.org/what_is_a_boundary_line_in_math.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/new_lg_phones_2020_boost_mobile.pdfIn PDF document text
    • http://wupulij.22web.org/21538318536.pdfIn PDF document text
    • http://ruzagasaz.iblogger.org/vowetawajajemolakevisida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_60299ec63f6c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5fcf4f9520178.pdfIn PDF document text
    • https://cdn.sqhk.co/bimowikosaru/diaiiij/emergency_dental_clinic_greenville_sc.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/kQkjbxl/87523931497.pdfIn PDF document text
    • http://pokuwasu.iblogger.org/mutabavonos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumawapuxol.rf.gd/20073024859.pdfIn PDF document text
    • http://javajese.epizy.com/guns_germs_and_steel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/free_holiday_office_party_template.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_659e0f9eeed346649f62c6c551d34a95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujixus/48254704537.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/48973106111.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_e7fe34f27352415e8d26f4b9eb358188.pdf?index=trueIn PDF document text
    • http://wugerubuvugox.myartsonline.com/58705222301.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_cc51143d400d47c2b0c2fa91b2efddf2.pdf?index=trueIn 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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5124 bytes
SHA-256: 8c34aa5f5bd710e7a458690c2948df561d3cd502c57cbaff713e7bc2d8f553ee
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 11556 bytes
SHA-256: b083ff5bf8221bd7819c6a4b2e0118a5e504674dd745024b8834f809ea52513d

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