Malicious PDF — malware analysis report

Static analysis result for SHA-256 218790204127cdde…

MALICIOUS

PDF

75.4 KB Created: 2021-02-13 12:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dfb3f18c09e95c55371639e9416ee544 SHA-1: 6c38aa4af8b0ce73a276d6972c27838ecc471b92 SHA-256: 218790204127cdde5b7fadd046e81534f5c08fb96fc6b3e4d24871224fb5b1d2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=free%20math%20worksheets%20place%20value%202nd%20grade PDF link annotation
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/dc2ea3dbd150.pdfIn PDF document text
    • https://gadepututam.weebly.com/uploads/1/3/5/3/135325389/naraletukesokamufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380883/normal_600602a99a266.pdfIn PDF document text
    • http://dejenenipanoz.22web.org/coastal_medical_center_case_study_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_60023ed5a656d.pdfIn PDF document text
    • https://wazufepema.weebly.com/uploads/1/3/5/3/135383665/bovatepomabokimoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_601b84bd58600.pdfIn PDF document text
    • https://sonatovixafu.weebly.com/uploads/1/3/1/8/131871956/zipunuwo.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://s3.amazonaws.com/biwubeleba/know_your_customer_guidelines_were_issued_in.pdfIn PDF document text
    • http://kagabefusexem.epizy.com/clocks_coldplay_free_piano_sheet_music.pdfIn PDF document text
    • http://nisuxukiw.epizy.com/protect_a_worksheet_in_excel.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/47400458492.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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 5624 bytes
SHA-256: c6f8da002b21e5ad6221880a8f8e7ea62280fa7b68224668553690b529876440
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10772 bytes
SHA-256: bd7c32c4884e5b7c12caa87898b5452aaf2e64aad7e0e81b1677cfe058ccbd2a
font_02_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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