Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d519379d2c4f49…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 04:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e02d542ec603f9f9fb9124709ca9ee7 SHA-1: e9f3edfd4838a56e4d48bdcef5dfdaecad626821 SHA-256: c8d519379d2c4f49c2b1594e911eba3f7b95e7b996e7a6009d9d97a14040d7d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The high number of external links, many pointing to potentially disposable domains, suggests a link farm or phishing attempt. ClamAV detection and ML classification further support its malicious nature, indicating it likely serves as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://artedeeducar.com.br/ckfinder/userfiles/files/saxisupax.pdf In PDF document text
    • http://silver.jo/ckfinder/blanc/files/90679152824.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/pizekiwuzewo.pdfIn PDF document text
    • http://newcityhk.com/userfiles/82263347841.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/lezekuzugedoko.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/pigujuruvapanuzapikanimam.pdfIn PDF document text
    • http://harlit.com/upfiles/file/xenaxesisakofuriz.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/54594033272.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/23512797625.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/31156352667.pdfIn PDF document text
    • http://poliinc.com/upload/files/57021600630.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/63799228907.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/feluvabupikugefiteminen.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/zusitigobafufan.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/48695490714.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gumepatemuvetujowep.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/motozodevazo.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wonubofujararima.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84be0c774---33248070271.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2ffa64b0---60970262458.pdfIn PDF document text
    • http://fnathservices.com/upload/file/tisob.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/44768241975.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/78431310553.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/25963228239.pdfIn PDF document text
    • https://hsse.cl/files/jixifuluz.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/nowidujutipogizaluzupameb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=speedify+mod+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 18332 bytes
SHA-256: 243336af724e5ebec3c5004c0d2555d961bc48e6bf0b0cd8605b6c5185dd95b2
font_01_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 10424 bytes
SHA-256: 4290f005cd84bbedef163eda3987b94d0a37982c61577305eb4ead4edf6b6288