Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ae1f9ade754989…

MALICIOUS

PDF

72.9 KB Created: 2021-02-25 15:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4be4b701b6901eda0ffe65c6fe32f0fd SHA-1: fa549767cfd4f077f8ab873acf267371e9738f1e SHA-256: b9ae1f9ade7549892b7a70b5b5a7eeea0c513ba4056a095a8f101d97bbff2cf1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to manipulate search results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://bologen.ru/wix?keyword=principles+of+the+constitution PDF link annotation
    • http://pugisapi.mypressonline.com/womigudime.pdfIn PDF document text
    • http://sedopusomivul.22web.org/free_investor_pitch_deck_templates.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/rigirevakid.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/larsen_and_toubro_annual_report_2017.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/how_to_write_credit_author_statement.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/567735.pdfIn PDF document text
    • http://pokavitapizinuv.iblogger.org/macos_catalina_developer_beta_access_utility.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamufigavoxi.rf.gd/cricket_ashes_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/nesnes_chilungamo_video.pdfIn PDF document text
    • http://zadosuwiwebuw.epizy.com/epson_workforce_2540_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/33623650455.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/data_untuk_cheat_uang_dls.pdfIn PDF document text
    • http://wefazor.epizy.com/3691803636.pdfIn PDF document text
    • http://defozuwonig.rf.gd/aitken_spence_plc_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/41560800619.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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 4892 bytes
SHA-256: d959941030534c4e746ba895437dfbf8294e2b015245953cb2377ce75acf6d4a
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 10396 bytes
SHA-256: a0b08548f388652573cd083279f281a7d84a482ca848fb52325d4e367f440785

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