Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e52b565c0b6b73…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 09:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2900c77d317353fe22db49fb32c7385 SHA-1: a3b62a2b3ae5f73c3ba3a46c479ca3f0aeaf2447 SHA-256: 72e52b565c0b6b73f937f9947e5d70c64de89dccb723d42f526585afa265f5bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to potentially disposable domains, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=index+of+games+of+thrones+season+7 PDF link annotation
    • https://topclassgreenery.nl/images/file/zibetuxosawes.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/befowewofosebefuninebuk.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ganikikafokuvegizovepizof.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/bakeserazodiwimezetine.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/48577869443.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/12355921117.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/kilofavomaxa.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/pugojudag.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bekofufavototodun.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/fufizof.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/gedegejuj.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/nanoxeros.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/pagaxabevu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ad6f4d5---xasikotox.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/bokukujireje.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/gulodorululexotevusevi.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/95592991790.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/43689903083.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/89760275706.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nomutagatigipamifoxa.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/pimixanujigakoxeted.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219101047491185.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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 10764 bytes
SHA-256: 1e00dabab6a97ebd3fc1f958e9eb6a4dc8c57d2cb822d2ccf581b2a32d3448ad
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 17236 bytes
SHA-256: 1fc6b4987134926ef864347fe08260695048984271ebdb79a3b7300ac97476c7

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