Malicious PDF — malware analysis report

Static analysis result for SHA-256 982b0cfc31de6dc9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 21:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e52d6ee8577ebe4498a527b89718849a SHA-1: 5fe31ad536a6680fc3cc7228d188917760fcb392 SHA-256: 982b0cfc31de6dc93ade96e415a74f81b7500a190f82cebb3a6b7d562186a647
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=iphone+platform+android+competitor PDF link annotation
    • http://minhphucvietnam.com/uploads/userfiles/file/megubobizukidobe.pdfIn PDF document text
    • http://etre-belle.su/images/file/porubusanejufajajesir.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/23608397101.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/janaw.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/vuripoteretutalire.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613661657382b---zowemusedudili.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/89027546326.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/pexinuwazupusuzatunesa.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/70752208943.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/remunikazupoloxikalow.pdfIn PDF document text
    • http://flyags.com/editorResources/file///21951498617.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/93197158943.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/14539543426.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/60512125899.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/tigadojoximanusugakaziva.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/lusudanubemeladomavadip.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913145515.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/wafesigujukovujefowowi.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/39644982063.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/fiwebiledekoxelu.pdfIn PDF document text
    • https://anandalaya.in/resources/file/68887155734.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5cb12aca---49507924385.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mowolimitesi.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_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 10668 bytes
SHA-256: 3365fc942de63a906466864961541e1824934440d6cb38c12bb6b0099c75af42
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 17292 bytes
SHA-256: a82cb813db50d9c1b0e888907a5fbacc6e88a1a00f3388fe605b11f0c362db63
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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