Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a4ebf781fe1861…

MALICIOUS

PDF

75.0 KB Created: 2021-01-14 12:38:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5be9a83424b84bff5dd32aecd9d63109 SHA-1: d527b681e940f40308656b0a554c9329a623c229 SHA-256: 93a4ebf781fe18617843e100974bba70628cf4bdf72553d18ba60311e579887b
184 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Gateway b1 2nd edition answers'. The embedded URLs, such as 'https://traffmen.ru/aws?utm_term=gateway+b1+2nd+edition+answers', are indicative of a phishing or scam campaign designed to redirect users to potentially harmful sites.

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 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.
  • 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://traffmen.ru/aws?utm_term=gateway+b1+2nd+edition+answers In PDF document text
    • https://site-1174757.mozfiles.com/files/1174757/t_mobile_store_number_near_me.pdfIn PDF document text
    • https://site-1174993.mozfiles.com/files/1174993/zazilarex.pdfIn PDF document text
    • https://site-1238581.mozfiles.com/files/1238581/circumference_worksheets_for_4th_grade.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/7424101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f9ff0d74c493.pdfIn PDF document text
    • https://dofukuligofevo.weebly.com/uploads/1/3/4/8/134869200/wewifuba.pdfIn PDF document text
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/6a5179d88d.pdfIn PDF document text
    • https://mirexoxufi.weebly.com/uploads/1/3/0/9/130969656/burajuzat_fasixamagetela.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/5a5b54290d11cd.pdfIn PDF document text
    • https://site-1168379.mozfiles.com/files/1168379/ielts_fever_reading_test_15_answers.pdfIn PDF document text
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff0bb181670a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f9c67fac57f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8756ac223f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_5fb51f6e9ea35.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
    • 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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 5124 bytes
SHA-256: 6aa0b819f285e46ee3df542e27ed9a3156e43c7b7273172332bdc1cf0aeace2f
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 11028 bytes
SHA-256: f1fdea5a6672b80a40ba942b320137b2d927df915df2d43023aab64d6f995584
font_02_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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