Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae3647d723dc7fa…

MALICIOUS

PDF

85.3 KB Created: 2021-03-25 15:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 78d8f26f38458a3d33107b66bed68222 SHA-1: be4a113b902b8ae158a7f82bf717e4a3d17f2bf8 SHA-256: 9ae3647d723dc7fa434b9d2cf59e26041955c2b39a73c4fe4cdb0df5dc2c440c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with several pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, possibly exploiting PDF vulnerabilities or using obfuscated JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://kuzutuzo.ru/award?keyword=rede+referenciada+bradesco+saude+rj+pdf PDF link annotation
    • http://votapusi.mypressonline.com/staff_performance_appraisal_form_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5feb2238cf393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6015993548618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_604da6c8ec6f7.pdfIn PDF document text
    • http://pipofuzekepug.iblogger.org/pejejetadasizoramowekejex.pdfIn PDF document text
    • http://eglo.club/japanese_wii_safety_manual9qo6g.pdfIn PDF document text
    • http://svoydvalend.xyz/8482541124572ipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_60187aa4c6c77.pdfIn PDF document text
    • http://rafupufubed.mypressonline.com/43654995416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5fdc640a4a876.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
    • https://uploads.strikinglycdn.com/files/9209f806-6050-42a6-98b5-cce0f1eb1c1a/buvokijef.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/new_bollywood_movies_trailers_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002e8604-7f2c-4936-8fe8-30bbc39e5fd8/11730921885.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/xadutusimujubajexugital.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/98091855912.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/64681122480.pdfIn PDF document text
    • http://sarososibi.rf.gd/tamilrockers_2019_movies_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/pca_guideline_judgment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005a5d99-3fc1-4112-9090-d75d672f0177/41825590544.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/ielts_writing_task_2_academic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901c645b-c5ae-4d79-a14f-a5097cd480fa/votowoxogibuj.pdfIn PDF document text
    • http://totajenu.epizy.com/bowel_cancer_screening_nice_guidelines.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 5140 bytes
SHA-256: cea10f1a7978cd4e5c31ba3844a62269ea7c38242dffc9bb8358ac3ba82f15bd
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 13944 bytes
SHA-256: 80c88f54a69f736ee65261913d03f1f1bae5db84d24c25c18568a43e5e72f0d9
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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