Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0aaeefe1b72ef10…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 23:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35d5ecdbc7aa7f13b8cffdfbd4262893 SHA-1: 842bc4cbe9594dbc4581440d085701dbbd407223 SHA-256: e0aaeefe1b72ef10921bad972b93d1c000a7932aa80c7f04b6c55f560c26dc0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=pixelate+image+android PDF link annotation
    • https://grupo-kayros.com/userfiles/file/44215595853.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/gazim.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/nipifosafa.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/fudixemen.pdfIn PDF document text
    • http://hidropro.hu/upload/60243500870.pdfIn PDF document text
    • https://haidangpc.com/contents/files/44183350886.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109032121403761.pdfIn PDF document text
    • http://st03.it/userfiles/files/fitesejogupaw.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/15180363890.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/17387598058.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/napojidusufegazo.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/bowemudikekinirumatutal.pdfIn PDF document text
    • http://amrapalispot.com/userfiles/file/16654550371.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/95703968704.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/97860188776.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tasojabudiziju.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/povasisuwerabava.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44274883850.pdfIn PDF document text
    • https://coevent.ru/upload/files/dozoxipukisilewedugated.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385f3152c04---76208527486.pdfIn PDF document text
    • http://halaljones.com/uploads/files/84379177893.pdfIn PDF document text
    • https://j26clean.com/upload/files/xolelavazorugola.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/47676745626.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_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10524 bytes
SHA-256: 5096d34a0ea0bf5be1d9449ea4b8b9d728b15a76e0aa1d1e260fb5b812175a8d
font_02_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 17540 bytes
SHA-256: a7e5d19559bf808c310041b214e6179766747c1b1df3b90533463cf25866bfa3

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