Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ecc4c0052fbccf…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 23:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1de3fbf3460fb5d5df5fa485599f6b56 SHA-1: b5fc8f68af59edd87030a35b063a12e3526ec613 SHA-256: 76ecc4c0052fbccf3cff14c4ec2c7207c5f92372d5d8be82679651b1e3b2bc60
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging it as a link farm on disposable hosting and containing algorithmically-generated URLs. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fejogokuvoberawoxawazu.pdf
    • https://lorus.rs/files/doxeneporatudinakit.pdf
    • http://dungcucaytrong.com/images/files/pamiwavetixazes.pdf
    • http://hondaototanan.com/upload/files/73664674357.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/fefamaradomov.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/jivibijoz.pdf
    • http://stromzeleny.cz/file/medoxusekosubowifodi.pdf
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/98211313801.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/pexesakuzubudu.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8eadc8908---74260688204.pdf
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/17238402093.pdf
    • http://evolutionchonburi.com/userfiles/files/tosuwogurabarulafoxag.pdf
    • https://abss.pt/userfiles/file/voxeno.pdf
    • https://veaodaibrahma.com/uploads/image/files/6410972960.pdf
    • https://btegypt.com/file/99591315290.pdf
    • http://halaljones.com/uploads/files/92499401081.pdf
    • http://whuntex.info/userfiles/file/89389736307.pdf
    • http://aaaexpressheating.com/userfiles/file/92929119927.pdf
    • http://autowagon.it/userfiles/files/80791893636.pdf
    • http://www.szphotar.com/admin/img/files/xomajitiganesatod.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_35ECD5E3AE56B88B.pdf
    • http://zhengfutz.com/v15/Upload/file/2021918226519343.pdf
    • http://ei-windykacja.pl/upload/file/vegixipixotejat.pdf
    • http://dailyxedayhang.com/userfiles/files/tegedubitibetapo.pdf
    • http://silver1979.com/upload/file/bivatediz.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b22bb884c2c652600f375b0e242a859d/lojusakapaporajaruje.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/23219814711.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=classic+words+solo+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_off0000b587.bin
49dad496c6fd9849ef6659cc6f808569c968e162cca7e966816271f33bd3ffe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB587 10384 bytes
font_01_sfnt_off0000cd2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 16792 bytes
font_02_sfnt_off0000e541.bin
a1f12aa2213f3974a33534035352bc7ec4461b490287b16618b90bfda09229fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 14516 bytes

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