Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d886ad8cb832ed7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 19:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b5728fc5881e3e5b06e409e6c97dcf1 SHA-1: 12f180d796a83d461b8f6a84eb50b04e97b9377b SHA-256: 6d886ad8cb832ed78b358b8c5047f4b374d5c8b33e11b768939e6c5f8c49c733
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hp-cnc.de/uploads/files/48004418955.pdf In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7bdb759d8d429e223a493ab6ad22bd17/66592848931.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/divimoketujapuruxomapus.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/63592963567.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/35267317374.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba0d8341d---zulaf.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210916_279FC4336A544F8A.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/kupevitob.pdfIn PDF document text
    • https://laps.pl/userfiles/file/bonurigadejogimelenaferul.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wunimujabebopani.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/tirejejonu.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/21692797550.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/karadenesaluzaresigaxego.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/bivadikotulon.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/10585908236.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/26669985620.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/livufimisiregekumiva.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/80147235325.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/20569001751.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/54225418999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+apps+for+android+2017PDF 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 18056 bytes
SHA-256: cdc9ff11e1d3a3093fcd6f8e761373cdfe13baa384f50ee9be5adb9e9c77231d
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10844 bytes
SHA-256: 3004c73ff356d51a665f0397cc2f78e3dc9c57b9ef58ba0b86bb214c47202cb4

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