Malicious PDF — malware analysis report

Static analysis result for SHA-256 06742b394e1b33d9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 07:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a289615a4495331441ac2847d8827a7 SHA-1: d9bcbaa93b4bf66c4c5eaef459c1e50eb8a8762d SHA-256: 06742b394e1b33d943b7aba67bd8c3add61fb18b87c70676efe7f1624154b62b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=android+system+recovery+3e+apply+update+from+sdcard PDF link annotation
    • https://uzsienis.cvzona.lt/resources/img/files/80588415129.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/79796540657.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rumabekisapelelesikol.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/3957271065.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/pagewiwu.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/88888909797.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/40796400340.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/buvosujonini.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613960c87834a---wuwemidorebarizupu.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/menutebikerudizamamuv.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/99252221122.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36231650158.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/pabikawosekozelolofu.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/55946451959.pdfIn PDF document text
    • http://elma1.ru/!upload/files/90659092016.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/11916802521.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/90852710144.pdfIn PDF document text
    • http://starma.pl/files/file/juputis.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/vagomugereguzigo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb6a148ea---57987632987.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mubapurok.pdfIn PDF document text
    • https://alpinashop.bg/files/xozugogenerom.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_off0000bb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 11212 bytes
SHA-256: 3bc1bbf8c024b0ed183931661aa0a72a18419cad924cfcbbf62a480b05ca08bc
font_02_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 17864 bytes
SHA-256: 6004b7a06b93eff15e175a0fdc69066bf8bc68478e91054d369dfd0424a4321c

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