Malicious PDF — malware analysis report

Static analysis result for SHA-256 024890a6d491c7f5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 05:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b4f75884c3dfb4641393a4a24ada3c7 SHA-1: 60e1b9e167bd406d34e89b2910fb0cac1e288b27 SHA-256: 024890a6d491c7f53bc4c0add4c152df1311d58e21216790a4f5b98d23f1aea7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous external links suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://hanart21.com/files/userfiles/file/67461295533.pdf In PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/53895007012.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/13835550431.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/98226175908.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/42933924789.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/kuzinidi.pdfIn PDF document text
    • https://masihpt1.com/contents/files/fovujunexaxada.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kinapovimojipagigen.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/ratitutazagufetetasu.pdfIn PDF document text
    • http://blueyee.com/upload/file/070746546243.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/suduwokezadanimex.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/13727270333.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/larawitikelokoxi.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/sopedizekulebipudufakeka.pdfIn PDF document text
    • http://ctm.it/userfiles/file/ropan.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/25458744561.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/tedoxe.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/46916329288.pdfIn PDF document text
    • http://vo23.ru/upload/file/92309529633.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/07f3b82a7cc796ab56dfb3680859f61f/nogiresijelokidiriretadi.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/ropizuniputumorozoka.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/72670705715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cast+in+mi+tv+stickPDF link annotation
    • 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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 10348 bytes
SHA-256: cc2d29478d844de69b68b2ab240fe155ecd804613c73fe5f00d700e03df60b50
font_01_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 18136 bytes
SHA-256: 0dfcc9a98b8f99030875a360d4da4c980277706ffe9cb05a1be75634f55173de

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