Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a295eaea3f9785…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2220164ab8fcf1c390d0ebd05d0d49b6 SHA-1: 152ff84bb7450ee94d7663f0c5a5c931a480acca SHA-256: e3a295eaea3f97856b1dc33c78e3b46314c7782e39c7792555198767e93c05bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external files, with heuristics identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and the presence of many URLs suggest it's designed to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bellina.pl/userfiles/file/49607747992.pdf
    • http://fuerst-architects.com/uploads/file/xazix.pdf
    • http://yanarfabrics.com/firma/files/41703128964.pdf
    • https://terracell.pt/images/file/82971095733.pdf
    • http://detskypohar.cz/upload/file/sukufe.pdf
    • http://llux.vn/uploads/files/9734572581.pdf
    • http://balcimimarlik.com/resimler/files/zazubipojo.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/toxobezetizerokupis.pdf
    • https://hazeloyun.com/calisma2/files/uploads/70752479108.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/rajir.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/muporezelelumilipoxe.pdf
    • http://ccspatti.org/userfiles/file/16821884462.pdf
    • https://robert-zauer.cz/userfiles/file/tikolezavelisowetakuvoru.pdf
    • http://cottoneauto.it/userfiles/files/lewalajuwowaveruxa.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/62ffe05e4faab0a4ea23c65b7af4c267/kikuxoxazitaw.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/porukalopenekapabofovi.pdf
    • http://nomayaku.com/userfiles/file/munipigakarikivejemurosa.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigefobakagidizopezi.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/widapupomizaxiw.pdf
    • http://monthclean.com/uploads/files/202109031021533554.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sdk+root+folder
    • http://e1pl2.nazwa.pl/busy/fotki/file/dozibefa.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_off0000d238.bin
872a078b16ea7a08deaa8c166143d9f02cbcc749ebdf50097124195df52c3703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 19044 bytes
font_01_sfnt_off000103cc.bin
f7cb29e9bef078f4e1cd175cbf1f336707690c49205b89261de0edc68bee3ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 9988 bytes
font_02_sfnt_off00011a1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 16792 bytes

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