Malicious PDF — malware analysis report

Static analysis result for SHA-256 506de9d6bc46dbc5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 07:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ba9c1496c1e3b1b203ae9a335add2a1 SHA-1: 7575c5cb04c4401a99a249000bfd4de7bc830f67 SHA-256: 506de9d6bc46dbc54ed8d0dace664a7c1c8059fb111ca9705b6d0efd829b942c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the heuristics indicate that the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=beautiful+words+starting+with+f PDF link annotation
    • http://corising.info/sa_upload/userfiles/file/20210913103616.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6f31d735---rijatubolawebusolin.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/54713452315.pdfIn PDF document text
    • http://th-hl.com///upload/files/baxoguxaxeronusitiketu.pdfIn PDF document text
    • https://vpmemorial.net/images/file/81972298385.pdfIn PDF document text
    • http://chinahongji.com/d/files/rowamokexa.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tikor.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/mejisozadipumobubofogaw.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914012241.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/9317657717.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rasupezajupomesojukifa.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/66109125481.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/46618320276.pdfIn PDF document text
    • http://zaiger.ru/img/file/manutufilobozozo.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/10783199083.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/xavuzavulikamefu.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/18137009989.pdfIn PDF document text
    • https://seikai.jp/free_images/files/fegoximejuwesuvemosadoroz.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/rudagejevunaliditebufuj.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/edb8dcc6b1d1ec97fd40037901186d40/falib.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/67949299126.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/koribesirawog.pdfIn PDF document text
    • https://andana.us/files/files/85341648077.pdfIn PDF document text
    • http://stefani.cz/fck/file/11118247258.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_off0000b977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB977 16084 bytes
SHA-256: d0d56f9505f669e277b72ffbf174b1188dcc0c4a9032257d75fab7435adf1d6f
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 10872 bytes
SHA-256: 0500e900e9e963f43a2b701673e0da79e5db1e78b30c784638e3642ba7011568

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