Malicious PDF — malware analysis report

Static analysis result for SHA-256 22707180991f2778…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 10:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4390b7e7d3c2221f215bfc42ff086d04 SHA-1: 25a629196fcde333b4275f0a82f6a65038b7582f SHA-256: 22707180991f2778d1fdc07a3d5ee5a5f8e0274b2acdd7f54c14ed3d72e2e819
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

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 https://synerhu.ru/uplcv?utm_term=watch+the+walking+dead+season+9+online PDF link annotation
    • http://demirlermetal.com/resimler/files/52365375314.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ccc62e218---gowumitojogineleg.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/furitorisujujesit.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/79765729479.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/10260880571.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/54417083576.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/89970709029.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/92013226033.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/28806027177.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/59845779442.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260081bc90---vavesidizid.pdfIn PDF document text
    • https://onecre.com/images/content/files/remos.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/3035818620.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/tonisijolig.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/98275566043.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/tujuvizaxuzoja.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/99079452876.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914151739843175.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/tiwojagufediju.pdfIn PDF document text
    • http://tianfonmm.com/d/files/68640560672.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nipuv.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/72047942407.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 10888 bytes
SHA-256: c2fd3da108cb9031da3633fd594eebc1453f13c56b1fc7fad08f12384e8f60d1
font_01_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 17856 bytes
SHA-256: 08d7988123ab3b8cab4a2cda2da5369b59aac7640f911631f05dd876a4f4d310
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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