Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5c8412b4d48468…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 23:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 73581f8b2afe685c9e13d9848c97cd5d SHA-1: 4eec7fc9f87939bed01599f9855f625bfb202b5b SHA-256: 5e5c8412b4d484683f111843728031d644a0544f9c2669e4cf4b9025a95b61b2
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=before+you+say+i+do+book+clare+lydon PDF link annotation
    • http://sexesex.site/research_proposal_budget_exampleq4k1q.pdfIn PDF document text
    • http://zubiki.top/ubuntu_server_18._10_64_bitw3tw2.pdfIn PDF document text
    • http://dinejokudino.22web.org/dear_man_dbt_worksheet.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/kabovalefe_tomemewe.pdfIn PDF document text
    • http://shopwithsale.website/satewebazimoniw4pji.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/kulel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/armoury_crate_v2._1._9.pdfIn PDF document text
    • http://wujikefixazoni.epizy.com/26097468775.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/20987084681.pdfIn PDF document text
    • http://roparewuna.rf.gd/naduvebaruxazu.pdfIn PDF document text
    • http://nodufezazu.epizy.com/26013961927.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/66985564394.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/tubemate_cracked_apk.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 3644 bytes
SHA-256: 15ba7576a95583a39d24e516b7e560eafcfe6d22ff3f6e64c585a1466b6f8e68
font_01_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 5372 bytes
SHA-256: 4da7fca8ea6177b9e350b171f87264b3a80aa70783349abe061e8653963c3cae
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 12056 bytes
SHA-256: 0245bd02f0b395ed18029e8f7546ad3b5186f5140ec7df18ecce688470e91ef3

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