Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2664b875a072f8…

MALICIOUS

PDF

72.1 KB Created: 2021-01-05 05:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4a5692058107314b9f41258c2c002288 SHA-1: 92b63409796f9580b4f840cfdd89a7911512d9cd SHA-256: 2a2664b875a072f8107051e13e2eda3ac097e4d9a6029eecc90e5437d6c5704b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to celebrity social media. The presence of a malicious redirector and the nature of the embedded link suggest a phishing attempt to lead the user to malicious content.

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://cctraff.ru/123?utm_term=nina+dobrev+ian+somerhalder+instagram In PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/puzal.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/heiges0/agile_methodology_swot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5fb73701cf50b.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/sanarubarusuz.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/0gchggf/23258964109.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/qje8gfZ/66434556546.pdfIn PDF document text
    • https://venivuwaw.weebly.com/uploads/1/3/5/3/135308653/fojorezaf.pdfIn PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/a6eedd4c.pdfIn PDF document text
    • https://zogetesiwuxiwa.weebly.com/uploads/1/3/4/4/134487963/jusenoseliw.pdfIn PDF document text
    • https://titajava.weebly.com/uploads/1/3/4/0/134096001/danut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5feb4c836caa6.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/YqvqiFn/bright_download_mp4.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/a760e766b2b.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/sozerevozamuk_kibovufepebu_noretifona_fifotavu.pdfIn PDF document text
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/b266f2aedc3f3e3.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/zulezov/bumonugebozi.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/7601402282.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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 5408 bytes
SHA-256: d891ae86c53c5103fc23d64d352a5d9f8114d729bbc6124a886af4f477031095
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 10324 bytes
SHA-256: 8309c27d7bf0c609ffb13e3e80e9e9ef1bc029eb93e5ff0f98c89049cda243ed

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