Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecce8af7c463811f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 15:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6eed84e91948399e36188f12a3a9f7c3 SHA-1: e1c6a74acbf881f9cc72200f7a1487cc38d1447f SHA-256: ecce8af7c463811f9cc79db0e7d83ee07735461aaf7290f7093990a625f62978
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://jottigo.ru/award?keyword=bricscad+tutorial+pdf', is likely a lure to a malicious site. ClamAV and ML classifiers strongly indicate this PDF is malicious, specifically flagged as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/award?keyword=bricscad+tutorial+pdf PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/fazaziminanidi.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/kanumuvawurup.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/2171f85e.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/3683147.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/nudilagurikidij_betajazavosaluv_tinefilugar_vibusamidulimu.pdfIn PDF document text
    • http://fdvsefwfrw.space/switch_c_formatwacep.pdfIn PDF document text
    • http://razvivatel.blog/gabupunevatelizefog2t5a.pdfIn PDF document text
    • http://fineagencyy.com/vavapiraxabejygq8.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/6ba9285253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_638e24f6d53245e9bebdf91811feef8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/personal_budget_template_free_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/limosezagi.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/6276934297.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_2410e345dbf04ae6848a91ef5573ddb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/nilitakurav.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/10026028148.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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 5200 bytes
SHA-256: 101e9a99f66ca541f32e861fad4d68389a0e50d2d75a9a5da2dc26dcf7eadc64
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 11160 bytes
SHA-256: a4cf2a087cc4c7bdd8236da63dfc4e7b8101a28e6c1374d470de474cce206638

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