Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e7b2fcd2e3a23e…

MALICIOUS

PDF

77.7 KB Created: 2021-05-22 02:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bfebcfeae19a87369dd37d5a9bc05ea1 SHA-1: 0ebe8397c194099b6f400c34b9e4c3ef9d15028c SHA-256: 55e7b2fcd2e3a23ea7b3df5bb8f56d2210254aaefc3a8613ff66e37893075573
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://seumenha.ru/strik, which likely serves as a landing page for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=what+is+a+scale+factor+of+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500677/normal_606dd96956059.pdfIn PDF document text
    • https://dedanolelixavo.weebly.com/uploads/1/3/4/3/134305263/7721115.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/3459827.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/dexiki_ditozinowuke_xuxisogi.pdfIn PDF document text
    • https://xelavizagak.weebly.com/uploads/1/3/5/3/135325118/8515390.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/295ca128e33c.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/7546894.pdfIn PDF document text
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/wumebavale.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/fowawituxofaxem.pdfIn PDF document text
    • https://fifesijewawo.weebly.com/uploads/1/3/1/4/131412558/e09e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_601723f727325.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/luxelula/cheppave_chirugali_movie_bgms.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/27837193826.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/amman_remix_cut_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/focusrite_scarlett_18i8_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/51745663887.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/tenufuvunowizazo.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/fisher_price_snugabunny_swing_straps.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/plantronics_m50_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/64545051160.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/staples_shredder_lockout_key_replacement.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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5072 bytes
SHA-256: 85f7bdcc7ab5a19064c279c9497e94b5080e23cbdc917cb77ce2617dfa07880b
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 11384 bytes
SHA-256: e5fc60f987a7b2993b90e5b60a7b2317fd4be0f13495fd4dc94f9d3d472d060b

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