Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4321fc5babc331…

MALICIOUS

PDF

68.5 KB Created: 2021-09-12 20:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15f9edf23347679ba7fba6c0fea4fc0d SHA-1: 005e961e2dfda3b1aaf26d1a2b98cbdc6697e358 SHA-256: 7f4321fc5babc331ee58663102bf3f7cd05fdf89d324a0e9a5ea040709356ec9
146 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable actions. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yenicekentkaplicasi.com/userfiles/file/74068391552.pdf In PDF document text
    • http://kool-house.com/upload/editor/file/55923874931.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/lidoremaviketixeguximabub.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f747e534---bodaw.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/jadoku.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xafafumomatelel.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/18474489015.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/migame.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/dobuzav.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gapibexululo.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zovetu.pdfIn PDF document text
    • http://canadianrockies.info/files/file/wemiwazudu.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/fawalama.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ta9peqm931vvdkdq4sa7o93i71/nawudeduf.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mejukanuxuzezirivu.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/kelepi.pdfIn PDF document text
    • https://red-adlay.com/upload/files/zurud.pdfIn PDF document text
    • https://atl-50.com/files/file/89371085323.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/risakemunixawafefila.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fuwefajigij.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/puxoselijiboragilugek.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/42600781921.pdfIn PDF document text
    • https://southafricapools.com/contents/files/vadib.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xexexod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+3+new+versionPDF 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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 14220 bytes
SHA-256: faaef23d860033a60a7d49301319cc8851a98b9e240c3b8665a0204ca74c7ee2
font_01_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10420 bytes
SHA-256: 0225175d1e11ef08bfc3b997e08bb5b6809f2533dac310a9f6ffcb8168013e57