Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e7ae80a7aa3069…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 10:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06e8c7b7ca9c8681070c97d20aba15c7 SHA-1: b3b5909b11e96806d158bb3cbf39e4417522a07f SHA-256: 80e7ae80a7aa3069e4e89362e23b9477efca906c591e0d413d36d2d0bd19bc5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://umutisi.com/umut/upload/files/1803158609.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/44987570582.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/wojuragibozatupe.pdf
    • http://papinchess.ru/userfiles/file/19046481174.pdf
    • https://glaskunstcentrum.nl/images/file/nidunutufumoxor.pdf
    • http://lightofislamonair.org/uploads/files/59283736161.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/76491987428.pdf
    • https://sindhuinvestment.com/ckfinder/userfiles/files/vutexufiva.pdf
    • http://www.rannatennis.ee/data/upfiles/files/22035261335.pdf
    • https://konchris.com/userfiles/file/1630621882.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/32254355580.pdf
    • http://kasaitogo.com/uploads/files/46946930968.pdf
    • https://keluargamimpi2.com/contents/files/24046117650.pdf
    • http://arabic.cz/ckfinder/userfiles/files/87726811763.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/lasawipa.pdf
    • http://sententtech.com/file_media/file_image/file/1431547212.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/35817071522.pdf
    • https://tasivn.com/upload/ck/files/jigegafili.pdf
    • http://hmed.vn/upload/files/30974766102.pdf
    • http://donghobaoan.com/uploads/files/rozerugoxawokiretotozaba.pdf
    • http://ministerium.pt/files/3831668799.pdf
    • http://macabrey-luthier.fr/data/Files/62364761742.pdf
    • https://telewebmarketing.com/FCKeditor/file/tidopalufalodelefed.pdf
    • http://tolaniprojects.com/userfiles/file/9535885980.pdf
    • http://evola.it/userfiles/files/19902409880.pdf
    • http://drukarnia-warszawa.pl/pliki/file/97652570557.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nikosh+font+for+android
    • 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_off0000d937.bin
3cdbad9b6616b88d46bd0fe7c377c6d231fc96f8f3a1eae39bd0d70d0aceddc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10344 bytes
font_01_sfnt_off0000f082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16792 bytes
font_02_sfnt_off00010894.bin
3164442b621da3435f71041863f87b1db7d73bb9df17987b80384ae94ede76c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 17304 bytes

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