Malicious PDF — malware analysis report

Static analysis result for SHA-256 11371a7294b8f6a9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 02:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43e12ece9e4ade1d5adb13958aaaea8c SHA-1: bf01b56756b76ae53fcb85642a6cc83b5d715887 SHA-256: 11371a7294b8f6a9ccb5c414b3bea419b2d142b82bf94079a20aa4cb2e7883aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=stepper+react+js
    • https://groupunsur3.com/contents/files/belikozasukiletinudora.pdf
    • http://cantinachitarra.it/userfiles/file/91372045749.pdf
    • https://ibrahimkoc.com/images/Media/files/nejetibefofesumuzu.pdf
    • https://remini.hu/userfiles/file/girezuzupatako.pdf
    • https://toscanafantastica.com/userfiles/file/6213321710.pdf
    • http://naim.naparts.com/images/fck/file/gewobevitusisuz.pdf
    • http://studiotecnicobonoli.com/userfiles/files/vinuzaguriroxivejurejan.pdf
    • https://styliststudios.com/imagesTE/file/pejakefodavoroveziroj.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaxododufonom.pdf
    • http://theexplorerthai.com/userfiles/files/xiwofo.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/razaj.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/vusineberivasebipegi.pdf
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/folebonumu.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/liminiwaxegawanijofirati.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/noxuxojiwujetunawero.pdf
    • http://modulobase.com/userfiles/file/45124809123.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312733ad2ad---66843702031.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/2657884823.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/70011058963.pdf
    • https://mkserwis.pl/userfiles/file/9559633841.pdf
    • http://ilturismoinitalia.it/userfiles/files/92575918439.pdf
    • https://hanedantoptan.com/upload/files/67127512852.pdf
    • https://hotelcorona.ro/files/99489335751.pdf
    • 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_off0000e0f8.bin
c7904f7f41e2b97c44406aee3c939b694029613eca995480dd95c96b190c24ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10208 bytes
font_01_sfnt_off0000f802.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
font_02_sfnt_off00011014.bin
a92b415f19f5c73c5e66c2df7855367664b7ef37f0c0bd81069996caff4a2891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 20052 bytes

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