Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa69991583d92a8…

MALICIOUS

PDF

74.2 KB Created: 2021-03-16 07:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ab4127b4884e46be1cadaa8a588bbd SHA-1: 716c8a41e6e9af537764502e14c8cb4e9fe790dc SHA-256: 3aa69991583d92a801698a775d036353c05a73e742c63de9f573705c54fcfe38
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

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://ponafet.ru/wix?keyword=percentage+composition+worksheet+answers
    • http://jadebey-x.com/libro_de_fsica_2_de_secundaria_editorial_castillo_contestado797lo.pdf
    • http://tk-pobeda.site/best_group_discussion_topics_for_engineering_studentspdhvf.pdf
    • http://agreevudb.rest/bose_companion_2_series_111_review8kjjh.pdf
    • https://cdn.sqhk.co/rijolumexeb/hfGjeGo/empty_eye_dropper_bottles.pdf
    • http://gogogoinst.xyz/6239572381385ep6.pdf
    • https://cdn.sqhk.co/sesakiwewe/igiGKjh/cfp_sdl_uk_buffettology_fund_fact_sheet.pdf
    • http://pearhaidhr.fun/8565638029hcs2i.pdf
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/fagijotamirixegov.pdf
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/6794102.pdf
    • https://cdn.sqhk.co/kegufamop/svigPjh/file_manager_android_tv_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_85961bdbae184828b01f35449b49c6fd.pdf?index=true
    • https://s3.amazonaws.com/gebukil/wopekarivev.pdf
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_0356345afb1e4737b3ee83559831a637.pdf?index=true
    • https://s3.amazonaws.com/wulagisi/43780579879.pdf
    • https://s3.amazonaws.com/potamotaz/76736911743.pdf
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_778a7f7c0bba4724824f55bfcfe8a779.pdf?index=true
    • https://s3.amazonaws.com/jiwisigetizoxif/rosary_guide_tagalog.pdf
    • https://s3.amazonaws.com/zumomasugipeno/segerutoz.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_off0000e46a.bin
a9e28530f5bf1a8aefee0a14592f0208da1b4450c1e8fe170f701100be244541		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 5472 bytes
font_01_sfnt_off0000f6f3.bin
d863988e7444fae085ae1b5b44ce9d5d0e2564eae21476332c1c2e4d836ff883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10684 bytes

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