Malicious PDF — malware analysis report

Static analysis result for SHA-256 772d890b57b80382…

MALICIOUS

PDF

80.1 KB Created: 2021-03-13 16:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 80df416c5982078028e7863329ba07e3 SHA-1: 9f46a23246edadc86b1f8f78be5f3162c9f0590d SHA-256: 772d890b57b80382758d49ecd2e29ba5171ebc78a1bc2bbef043b7425e36c7f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to obscure the true destination. The presence of a 'download' button heuristic further supports a malicious intent to trick users into navigating to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=bullet+force+hack+apk+2018 PDF link annotation
    • http://afracheat3.xyz/microbiology_laboratory_theory_andfvkwy.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/da6a5a.pdfIn PDF document text
    • http://francobusiness.com/four_corners_2_workbook_answer_keyk69ci.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/UgjjcgD/23771229602.pdfIn PDF document text
    • http://lavkavkusa.store/everyday_math_grade_3_unit_3_study_guiderjf89.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/gcsjjgi/lodinilerapuragugalikog.pdfIn PDF document text
    • http://testertumentum.space/business_report_writing_downloadg2clf.pdfIn PDF document text
    • http://the-job.ru/tebugd3wj7.pdfIn PDF document text
    • http://reduslim-sito.site/nilezifopdwhy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601b978312bee.pdfIn PDF document text
    • http://prizyivnik.ru/learning_styles_free6ochk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fdc27939687a.pdfIn PDF document text
    • http://naturwow.space/kisunogotorowadofidaso4dyn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_601cecdb2ab79.pdfIn PDF document text
    • http://the-glow.ru/rezogutoooqcs.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/bekaxogajixuwak.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/4e1f2e42052400.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/YhdBjhl/49104368910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_6042c9e317606.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/e898fc9f-4219-4f2c-9427-27e7e3f8e0a9/bear_archery_cruzer_g2_rth_compound_bow_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f34e97-c0dc-40bc-8539-f99c6be7007f/asus_router_rt-n66u_password_reset.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_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 5560 bytes
SHA-256: 5e1c67c2a9e0a36b938dc7f0d0c04297d60fddd04066fe960cadda24e088feed
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 18480 bytes
SHA-256: 04b5cfd9f626750dc649a305653f900e7debbb1470c87faf51513fbc73671b2e

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