Malicious PDF — malware analysis report

Static analysis result for SHA-256 2654f5bab4955254…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 09:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ed27d5ab1ab889328d632a2736f8e48 SHA-1: 78bf35ae8b26371b1070c2737f110f6700c76b69 SHA-256: 2654f5bab49552541bfe9aaa3181726eacf8cc7a9d0c9a5bb006cee450df6e16
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a high density of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vrieshorst.nl/images/uploads/file/21724194656.pdf
    • http://mercuresamuichaweng.com/admin/file/41743622832.pdf
    • http://yummyschool.com/_UploadFile/Images/file/33982216055.pdf
    • https://abyway.lv/images/ck_images/files/71379607078.pdf
    • http://dongshengcable.com/images/upload/File/denonuluwababid.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/20205433959.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/fegabofufagotesibix.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f303ce4610---82281258576.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/ramapagadubowenalomedawed.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/79145477245.pdf
    • https://immo-macedo.lu/userfiles/files/60861617560.pdf
    • https://membermimpi.com/contents/files/2975669154.pdf
    • http://abwessex.com/uploads/files/fazavazu.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614530d91fee3---62982668738.pdf
    • https://altsovmun.ru/userfiles/file/47700586743.pdf
    • https://airxps.com/userfiles/files/19673021877.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e5ed664569e49db239e6d2ea06abefa3/26875841292.pdf
    • http://hypotekaprezamestnancov.sk/res/file/74794601355.pdf
    • https://www.mds-horizons.com/upload/files/21684778850.pdf
    • https://advik.net/userfiles/file/77279463403.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/ziwedadebi.pdf
    • http://hstechno.com/userData/ebizro_board/file/92594064119.pdf
    • http://newo.ru/files/files/xosiwuzosuxuxelegipog.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44555596204.pdf
    • https://datatech-int.com/userfiles/file/zorabudid.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/fitafabexokisew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dallas+on+austin+%26+ally
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dece.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 16792 bytes
font_01_sfnt_off0000f6e0.bin
9f1c09038cffffb202e512c78705a7768f9829553aa8a90e4b8962d2f38cad88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 18796 bytes
font_02_sfnt_off000128ad.bin
9b598c6f4dae090e5b335c9e53d6273de14d96b3cbc4ed8b4c22904228f9ad68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 9968 bytes

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