Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b9854591a2766…

MALICIOUS

PDF

79.8 KB Created: 2021-03-01 02:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c9e2d330f0a94cd8c77a573eb23962f8 SHA-1: 57c8ef6b449b72202af7cca2aac9770bce8110a8 SHA-256: 8f4b9854591a27663b5785d4c2ea1ab4f9cc9d6b5f505f9987a0b06aa8ca0197
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic indicates the document employs social engineering tactics to prompt the user to execute commands, likely to bypass macro restrictions and download further payloads. The embedded URLs suggest potential C2 communication or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://midufefew.ru/aws?utm_term=dd+wrt+asus+rt+ac66u+download PDF link annotation
    • http://francobusiness.com/how_to_use_the_snark_super_tight_tunerfzzjn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fe425883e746.pdfIn PDF document text
    • http://italy50wow.pro/fire_emblem_three_houses_endings_guidegwuvp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_6030e54a8c0df.pdfIn PDF document text
    • http://italystore.pro/57803854698a5uzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_5fda5e2e1d6f3.pdfIn PDF document text
    • http://uablog.site/63576293038j95yt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogetowem.onlinewebshop.net/best_app_for_child_to_learn_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/sumukug.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/voxeguret.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/what_does_termination_mean_in_lawsuit.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/semax.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 5180 bytes
SHA-256: 032882a043cf3f7eafe7abfc10427f8f202c569db9c7ed2f7781da3613ac5371
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 12988 bytes
SHA-256: 7f00c1e41f4c72fb217256baf53c4e00f6b79859893144ad5950c695edd21248

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