Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89460a5c7645421…

MALICIOUS

PDF

71.5 KB Created: 2021-02-15 17:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a98f4b7ca6409534ae3ab68ffb58c9fc SHA-1: 38a17ae8d54f00167c036cc7f2c289762419f19a SHA-256: a89460a5c764542103234cd2d5b7141092528d1798a298684a555a1f6547c967
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an external URI pointing to 'maypoin.ru', which is likely a malicious domain used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=what%20faith%20was%20cs%20lewis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493579/normal_5fdcb4d873a32.pdfIn PDF document text
    • http://natbeach.space/4401175493hw3ix.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/kutivumanukovaw.pdfIn PDF document text
    • http://vikedax.22web.org/wimize.pdfIn PDF document text
    • http://lazezubeb.22web.org/ina_linear_bearing_catalogue.pdfIn PDF document text
    • http://everydays.space/chemical_principles_7th_edition1ib6w.pdfIn PDF document text
    • http://farvestnn.ru/download_leapdroid_full_versionfc7lz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fc5a0ae8ee02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bubewap.rf.gd/haematology_report_normal.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/59902104110.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/kantar_omnichannel_report.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_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 4976 bytes
SHA-256: fc01e0565d40bdb8a928c624322c0de0babb59a0f9b72d6111e5d581d92edeed
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 10280 bytes
SHA-256: 2010a8cec0ae80da9d6fb5a9daa3cbf47b16b8729edb603b30816efac8bae781

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