Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77cf630c88d4fee…

MALICIOUS

PDF

68.6 KB Created: 2020-11-24 07:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b9439b566889d6609a85e626716c97ab SHA-1: d183400c1a2c6f281a1337881639369763c2307a SHA-256: e77cf630c88d4feed3a828a4dff7ccbdfd34aa481a09aff3404754abfc4f6894
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'The Voice Australia' and the wkhtmltopdf application, suggesting a lure to a phishing or scam page. The presence of multiple PDF link farms and a critical ClamAV detection further supports a malicious classification.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/123?utm_term=the+voice+australia+season+5+episode+1 In PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/86a22a2f8b40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5f8e256231a93.pdfIn PDF document text
    • https://kupubasurunasoz.weebly.com/uploads/1/3/4/6/134695217/9c14a1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_5fa4f3402f469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fb7ef582015a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fb9573715ad9.pdfIn PDF document text
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/9a7a8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8d986731763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f8c00ec38e9c.pdfIn PDF document text
    • https://mabogafopesusa.weebly.com/uploads/1/3/4/3/134307699/ridazusobo.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/pusori/alphanumeric_series_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/cen-tech_multimeter-digital_clamp_95683_how_to_use_it.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/army_class_b_uniform_setup_guide_female.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/conditions_of_participation_interpretive_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/half_marathon_florida_january_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/square_d_breaker_panel_label_template.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_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 5344 bytes
SHA-256: ec6fe7a12280ce9dd2bcbd7ad29d947b771c8a406192c013d2c16f46cbbbffb9
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10460 bytes
SHA-256: 154f8f42b04313d089348f3825f343b31a75d11bdef1ca23765af7da95ef1b76

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