Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d4c694f18e9d5d…

MALICIOUS

PDF

77.2 KB Created: 2021-10-01 04:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1819762b4812dd4caaba2972de2d36cc SHA-1: a0582745d520b120fcd302aff9a6f2f117dc8c6f SHA-256: b2d4c694f18e9d5d4cc8ca0015e4b8b9a1bb41a4871544ff493d38b2e92e360a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://wastran.ru/uplcv?utm_term=best+archiver+android
    • https://emmaushuis.org/pages/98717117545.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/83357148248.pdf
    • http://terfigyelokamera.info/files/file/47009447163.pdf
    • http://sokole-tps.pl/userfiles/file/702252476.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5e5eb5a89bb45c8f6c60ccdd617c1104/65604451315.pdf
    • http://sreema.org/FCKeditor/file/tivasikutamapimemuker.pdf
    • https://zlataraburmevuckovic.com/files/17747295848.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/13360935380.pdf
    • https://bdblue.com/ckfinder/userfiles/files/gakoxepebusunute.pdf
    • http://primethailand.com/ckfinder/userfiles/files/xezibakoragagus.pdf
    • https://fleschimmo.lu/userfiles/files/zepew.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161535889d3fc4---jelenonadelatedobon.pdf
    • http://cga82.com/admin/File/66129836387.pdf
    • http://www.centralperdana.com/file/34841157703.pdf
    • http://cuanhuadanang.vn/uploads/image/files/tewalezo.pdf
    • http://studiomarcheluzzo.it/userfiles/files/suvofosi.pdf
    • http://le-nora.com/userfiles/file/68668014764.pdf
    • http://marathon-gexin.com/Uploadfiles/files/rowutexunisiluzilej.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/kadeverarajafatofona.pdf
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907200446.pdf
    • https://designsdubaiukfashion.com/userfiles/file/79236014751.pdf
    • http://zamaro.info/images/fcke_files/file/93459544928.pdf
    • http://rmgoals.com/userfiles/files/6973092930.pdf
    • http://cozycornerexpress.com/uploads/files/41081436425.pdf
    • http://snsi.jp/image/news_file/nerolugobinizikamedige.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f0.bin
b64889852e61056c9b9039c0f1c2a57905ffd672d9260c073ef632c99a4e006e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 18648 bytes
font_01_sfnt_off0000f6a9.bin
f5b84bc782ad919c8b814fbd8743d880cb05b73d029cc9282acb07d802d1e617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10540 bytes
font_02_sfnt_off00010eb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 16792 bytes

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