Malicious PDF — malware analysis report

Static analysis result for SHA-256 a818dc55ac4bf7cd…

MALICIOUS

PDF

83.8 KB Created: 2021-03-01 10:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9521ac1e989831c1f88d79b42ab38ce4 SHA-1: 9a5abdaa203d2e08324e7fb14ff93dc6a640e5e9 SHA-256: a818dc55ac4bf7cd5492b5a8186256d99093bae674ffb271e4ce26109ddb24a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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://resalured.ru/strik?utm_term=why+did+immigrants+tend+to+group+together+in+cities
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/vanefiradadapewov.pdf
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/d45b1c2bf04b.pdf
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/filiruwekedarevof.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/dufosiw.pdf
    • http://kiwenalod.medianewsonline.com/19983814081.pdf
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fd676c242c86.pdf
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5ffbe4be4dc69.pdf
    • https://jeradowekijulu.weebly.com/uploads/1/3/0/7/130739924/9518197.pdf
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/814dd75.pdf
    • https://supuniwugi.weebly.com/uploads/1/3/5/3/135317388/bisararokaludi_jaxutaritib_jefipaxa_fanovonu.pdf
    • https://vukuxonujifated.weebly.com/uploads/1/3/1/1/131164545/tapikakij.pdf
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/5127234.pdf
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/25482d87c779ef.pdf
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/puvuwezawomi-vifilegozuzut-lofuti-juxibatem.pdf
    • http://gubixazolela.sportsontheweb.net/maytag_neptune_washer_operating_manual.pdf
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/7921302.pdf
    • https://cdn-cms.f-static.net/uploads/4412584/normal_602514743ae97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xujitezu/linajokepafulexarifon.pdf
    • http://kavibajegis.onlinewebshop.net/daily_grammar_practice_5th_grade_answer_key.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_off00010bac.bin
023ddff17a3052d258774cbb5f4207261961a039e2401192bb4df30e8dd6f0cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 5572 bytes
font_01_sfnt_off00011e82.bin
4fc43cab91b2ea1268165d837d9aa6d744d226be8714d4187701b804bd834bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 10276 bytes

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