Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb3d02656b84807…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 04:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3971ff60c851c3aaba6fc04aa2b7c4ce SHA-1: 66d689938b53b052b24367ea995ddd5cb6ae4f0d SHA-256: bfb3d02656b84807b19db1e15e6cb7ad5eb31769d236e95851246b8644bd5476
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting it's used to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=heart+wallpaper+hd+download+for+android+mobile PDF link annotation
    • http://tajilin.com/upload/files/pagulewofegesevavabutawe.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/54780975393.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/38951391850.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/wazesaragokiteriwi.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/buzezenijob.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161326e61cf009---pisatimezapalebawonogeket.pdfIn PDF document text
    • http://snsi.jp/image/news_file/5194042953.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/10322502591.pdfIn PDF document text
    • http://chromavials.com/d/files/ritafoduwelisofe.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fuliwexagixoler.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/vazovomelejesula.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/donavebikunexonunijiw.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/42242955142.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xurikanijemusar.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/91486758787.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/kefutegovo.pdfIn PDF document text
    • http://sentralperdana.com/file/jonuguxavuzemomalewakum.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadavipajubobupixo.pdfIn PDF document text
    • http://wdnederland.nl/file/45674975451.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zekenojapanuxigate.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/tifesoru.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kirasufumatinafidupo.pdfIn PDF document text
    • http://namngonviet.com/user-/files/4180511357.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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 10812 bytes
SHA-256: fea606d9ff9e880c37bc655c1dc8526f02430d8316ca790c0a144f02ec517691
font_01_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 16748 bytes
SHA-256: d9b458e003299af9a2710b4d05bad627f7a63328d71eba9efef9de61fe574cb0
font_02_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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