Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567e6a1c0db1c8e…

MALICIOUS

PDF

75.4 KB Created: 2020-11-17 16:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5bdec9486acea261c54424247a368629 SHA-1: 2b3913686229aa22c404b3d77c0e9827e01608ee SHA-256: b567e6a1c0db1c8ee70be4614da359b563c2c147da33ebb2436aa8564f0a4f68
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the presence of numerous embedded URLs suggests the document's primary purpose is to lure users to external, 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 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://traffmen.ru/strik?utm_term=the+energy+bus+jon+gordon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fa67003d5d39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f91660147865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f8775821968b.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/varimosugiw.pdfIn PDF document text
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/vesabo_robifej_rokapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5f909792c62ee.pdfIn PDF document text
    • https://dokipodaj.weebly.com/uploads/1/3/4/3/134306773/zunefisem-zarixikisika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5fab10cca5f6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/613cec4e-bdbc-4ffe-8f20-860a1002b7b0/www_i_escolar_com_mural_web_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74082589-4bb8-4d34-8349-0af004bf352b/pavevixulujodulepoj.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/599543898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351e0eb7-000a-4f07-a095-c6f1808010bd/kojatibixafaren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0514a5-7dd5-44f4-a626-2a3711e29ece/proyecto_10_espaol_3_secundaria.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/sebi_guidelines_on_rupee_denominated_bonds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da33097-dba0-414e-8dad-48d258d6c7d9/danganronpa_2_freetime_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7094f501-2c7a-4814-a6a9-77b23f905569/build_strike_galaxy_cosmos.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 6548 bytes
SHA-256: 4200db6c0e80cadcb5e6095e2db64c6b33cb2c0480475197fd4329a98774db8e
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 5112 bytes
SHA-256: d9a2e9463903ac0f7d2a47be324f80bad009acb34c35f9b6adce54feb8d3e7b0
font_02_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 11272 bytes
SHA-256: 39a409590c959c8d8e9abe7808c3aae08e5c66b2e516aad9274919ff98e57db5

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