Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9694c05a335b31…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 14:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ab3cf6f36c24bff46b51efde9da7516 SHA-1: d7a5ddaddc5c24dce41130f223f9d435cf179e4c SHA-256: 3f9694c05a335b319dedf82d2afdb0b070be3cfd563fb8fc07cc1e7073731a0d
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, likely to trick users into downloading malicious content via a deceptive call-to-action button. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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 https://b2bircruise.travflex.com/bot/ckfinder/uf/files/34009865101.pdf
    • https://champion-osk.pl/userfiles/file/mometudojim.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/94991526093.pdf
    • http://suamanhinhlcd.net/userfiles/file/99285741181.pdf
    • http://zenithmetals.com/files/donigojomazafed.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/xajaduti.pdf
    • http://babywagen24.de/userfiles/file/46269922677.pdf
    • http://suphammamnon.org/uploads/files/bozovujopamo.pdf
    • https://nulifeus.com/~nulife/userfiles/file/japikixanetamaxuzon.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/63396868475.pdf
    • https://groupunsur2.com/contents/files/tuzen.pdf
    • http://foxadv.net/file/koxiwokajurerakepu.pdf
    • http://adbrf.com/files/fckeditor/file/10560561461395f264c6a5.pdf
    • https://dadesigning.com/daduserfiles/files/zutipi.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/logejotewewolokilutalor.pdf
    • http://coreaad.com/DreamDataUpload/file/zijelosiniroziwul.pdf
    • https://andana.us/files/files/fejosetexosagawobodid.pdf
    • http://strap.sk/uploads/file/lexuvis.pdf
    • http://dlzhrjd.com/images/uploadfile/files/filoj.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/posovugutuvib.pdf
    • http://www.heatandgas.com/EditorImages/file/38816452830.pdf
    • http://studiotecnicolamanna.com/userfiles/files/kibirized.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=feed+and+grow+fish+apk
    • 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_off0000c3df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DF 16792 bytes
font_01_sfnt_off0000dbf1.bin
23c3c100730b3d48c2968d75476c2b7c825baa2542e05bb03b11aab34d946980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 17672 bytes
font_02_sfnt_off0001099c.bin
fb01f9f7b4924f77753ac18fd9fb46ca5c789da2d19d47ca62b87c11b2f4731c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 10788 bytes

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