Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc81cfaa18e7069b…

MALICIOUS

PDF

74.4 KB Created: 2021-02-14 15:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 83c00659b916b980896fab947346c2b3 SHA-1: 446c147d3b2de564bc8b94fd9741170a00509cb2 SHA-256: dc81cfaa18e7069b81fa675e377beedf9a42d653ab676b01f9d656807a4e49bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=avia+template+builder+wordpress PDF link annotation
    • https://mojapilujo.weebly.com/uploads/1/3/0/9/130969316/makegederu.pdfIn PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/9575371.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/c74fb555e644.pdfIn PDF document text
    • https://dokerawu.weebly.com/uploads/1/3/4/3/134313580/kudolejoked-fijabu.pdfIn PDF document text
    • https://biwaxosele.weebly.com/uploads/1/3/1/4/131437294/kaweranexuzit_refevuwonu_mufumamoko.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/duremuzobugonomizifo.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/7f9b9e1.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/bijafuluki-kuvem.pdfIn PDF document text
    • http://buloshnaya.site/xafirixanuwakifuvinpyv2.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/fb35e71cd03.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/b2a2d94ea3a88aa.pdfIn PDF document text
    • https://lozorodarefela.weebly.com/uploads/1/3/2/6/132681783/kijaxadaxidozezuru.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/gagotaniwipure/comparative_adverbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/minecraft_1._5_2_server_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/zomazojen.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/jodupatareta.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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 5388 bytes
SHA-256: e3d50af0f97389b86f04c792dc9ae609ddfcf17e7e8ad85e66ba5e3a0229e565
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 9688 bytes
SHA-256: 202114824281a2d9fa740bbadd30fd8884b5dad6118b3b8bcf53e56e2330b9ee

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