Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2a7b2f2d6d81bb…

MALICIOUS

PDF

72.7 KB Created: 2021-05-01 13:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95e44e23e5224bf646ea08011b693682 SHA-1: e73e15d35de9b257ed3e1e42c757671a591ace2e SHA-256: 3e2a7b2f2d6d81bb750722f99f8f45cd066cf243f565298107dbd4f7fed774d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for phishing or SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=creative+sound+blaster+x-fi+pci+%2528sb0460%2529+sound+card
    • https://sotoxitubomiv.weebly.com/uploads/1/3/2/6/132695919/ae4f3.pdf
    • https://cdn.sqhk.co/wesebewoweva/jeiboYk/ritezugadijepum.pdf
    • https://static.s123-cdn-static.com/uploads/4424007/normal_6000b3f4153ca.pdf
    • https://cdn.sqhk.co/janawezexoj/z2d5rhi/talking_rolly_puppy_dog_pals.pdf
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5fced96109add.pdf
    • https://vusasetimonumak.weebly.com/uploads/1/3/4/8/134855164/xolojujipegib.pdf
    • https://cdn-cms.f-static.net/uploads/4459329/normal_6030983bdccbf.pdf
    • https://cdn.sqhk.co/fugovigul/igyjcXb/85531017900.pdf
    • https://cdn.sqhk.co/gadewekunel/gegiE8y/adobe_analytics_report_builder_row_limit.pdf
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fccea016ddae.pdf
    • https://cdn.sqhk.co/lotuwuzu/fwXjChi/snap_puzzle_doom.pdf
    • https://static.s123-cdn-static.com/uploads/4388824/normal_5fc7df62f0080.pdf
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fccb95911e69.pdf
    • https://luzafoku.weebly.com/uploads/1/3/0/8/130814295/juketuwiliwaleterowo.pdf
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/c653c27.pdf
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fdb01b3920c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://togugufi.epizy.com/android_app_bundle_in_react_native.pdf
    • http://nawonarubital.epizy.com/7712560231.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d893.bin
0efbfbd03ebac6e2081b1ff0fa47e5ddd3a4ad6ab2c0fd5492e624567c34306d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 5892 bytes
font_01_sfnt_off0000eccc.bin
310a5cdcf335d6b91add7fd7e8473c17dc3e836a9fff0c16e7b8b2210be5840d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 11468 bytes