Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e2e58d49ebd80d…

MALICIOUS

PDF

89.6 KB Created: 2021-03-15 11:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf30c1007aeced7dd753ba81755a7f5 SHA-1: 1d8313d1431e97f51f8ab836a657bd25d63c7c7c SHA-256: b9e2e58d49ebd80d8accfabbe6ca4342167003fbd443fe91301d3ae516d1be75
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=que+es+una+maquina+termica+y+ejemplos
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5fde8f25765bf.pdf
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/fopim-zelojepijar-bavisaj-fivevozunafe.pdf
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/kuvakusir.pdf
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fe9302a71b04.pdf
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/zoruz.pdf
    • http://lnstagramcopyrightcenter.com/rapabafavujakilevo8amtu.pdf
    • http://educationonline.website/nirunonuluvbpywk.pdf
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/wuxif.pdf
    • http://avit0.pro/39266581316ovh2s.pdf
    • https://pemovoxi.weebly.com/uploads/1/3/4/6/134680353/karojabino.pdf
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/2390981.pdf
    • https://paporese.weebly.com/uploads/1/3/1/0/131071113/3239466.pdf
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/sodubusi_tabenu_dikonal_divasetazop.pdf
    • https://pusuranan.weebly.com/uploads/1/3/4/5/134598414/a51c57ab3c96e.pdf
    • http://ueuniti.website/helicopter_crash_chernobyl_footage7d6yx.pdf
    • https://beweluka.weebly.com/uploads/1/3/4/6/134694692/rorakibinikujataniba.pdf
    • http://organic100.fun/xamilerolabutivuwosubowy76r.pdf
    • http://copyrighthelp.info/moloboboropoxixibijuhny.pdf
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/sepuvinojugo-puzexojaxi-benafekojire-lovonadagunil.pdf
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/mamiso-bawigodalebiv-lomiz.pdf
    • http://sibuvre.com/701858231047y156.pdf
    • https://static.s123-cdn-static.com/uploads/4457577/normal_60097b1d54ed7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e81.bin
814097c09c86c12f852dde837887416eacd511ab96da57f2b18d4477c24dcb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 5324 bytes
font_01_sfnt_off0001208e.bin
efdfcf684ea0b7eeee53ddbfc7a492ce4cd48ca21551c5e53aae4e6e124aca27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 12380 bytes
font_02_sfnt_off00014908.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14908 4324 bytes

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