Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbc29fd21cebe06…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 09:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bea5ccafbb2486fd061f8c7f2adf6e8 SHA-1: b82cfccaebebe265a4da63b92692d9dca08148b5 SHA-256: bfbc29fd21cebe06bad605e4016d1f42ff730c8c825a1c143e722e341a6c2fc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=nokia+n+gage+games+on+android PDF link annotation
    • https://illustrations.noche.fr/images/files/latobepipasufofop.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fijurubirutunib.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37652706706.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/078f9a5c94bd586d502e2ba242492142/dizozarezonosa.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/nodiwonituxolap.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/taguxakefekomid.pdfIn PDF document text
    • https://shevian.com/images/file/96517234312.pdfIn PDF document text
    • http://jawarakreasi.com/file/fomofagate.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/xezovanaguvekuro.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109081338145963.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/88960874607.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/perijiwos.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/gixetajiwatiwemavawilenad.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/bugefi.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/demoduwafomaluguwumeti.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/19364014694.pdfIn PDF document text
    • https://forumsevens.com/images/file/rixafonoxunutobumet.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bewavavegexutute.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/sigovobidosewedimaruti.pdfIn PDF document text
    • http://inica.org/files/file///mifuditativitinexuvavux.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/fiperizupalaneluk.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/tidofunugumebel.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/bogojopabilironagiferemu.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/lodafubore.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193036413144.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://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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 10516 bytes
SHA-256: 3082ad753cc1d86aef66c018911babe33e69bae9bc459fd8e518380fac1c6068
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17048 bytes
SHA-256: 565317ba516440528a2a124191a351222d857261951b1472471221763a052454
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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