Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ab2e8599dd07ed…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 15:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b47f608228fec2a015b91132f5936bd8 SHA-1: bd7fe7976074573111e7bc5c3a3681bf554686c1 SHA-256: 63ab2e8599dd07ed0bcb6ab5e14a8185d7d83df8ff8b2ff453387d9a7bc4a71d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=slow+motion+fx+pro+apk+mod PDF link annotation
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/luximulagerimokek.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/98057611164.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/74291228246.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fovejupumumu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904124535785164.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/3907163656.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/lidiledorusuvanege.pdfIn PDF document text
    • https://penzion-palice.cz/content/57545024154.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xekit.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109131147494069.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/47323694862.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/79952150754.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/69328790301.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/lasimuwivevira.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/18346608660.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/newopaguzuwagiravovidu.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/zidojapakukabi.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/xirifowonoz.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4f1edac9---44675204143.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/25002753377.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/59591043868.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/13696278881.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/46703774882.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/4087132556.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fejufuwozugozafa.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/254432282.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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 17368 bytes
SHA-256: af26c47a3428407773ad5f8a0d132e75a582491b3f25ae631836e1f0dea427ec
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10712 bytes
SHA-256: 756f86d7f43a2c101d07f957e4e9c670504b6641723772e5328429737a6a4e3a