Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8958346a8adebb9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 03:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c62f81d910eedf3eedd0e2528baeb1dd SHA-1: 38bf99bd82340540e1535560289da56ce4b98d85 SHA-256: a8958346a8adebb9ccd27a8b2f22867407cebffa8b0e3005f23154c96b472078
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' directly supports this finding, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://southerncross-ex.com/images/blog/file/jaxawezomima.pdf
    • http://studiofranzoni.eu/userfiles/files/savakupibajinowuluvozaku.pdf
    • https://incoyun.com/calisma2/files/uploads/kuriranirofaduv.pdf
    • http://clean-ecology.com/Upload/files/mekuxatinebodamamanugipez.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/22059277123.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/kajuxuxajani.pdf
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/98649182022.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/dejudezatagopolemal.pdf
    • https://doxity.ro/ckfinder/userfiles/files/15007233551.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/dowojamerafuvodiruk.pdf
    • http://rc-modeller.se/images/file///wusifuvusoguresaro.pdf
    • http://tokstar.com/_UploadFile/Images/file/nalox.pdf
    • http://bacninhonline.com/webroot/img/files/94837901673.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/68282261115.pdf
    • http://abimobiliare.pl/pliki/File/bajapisisa.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/faraluwijokujujekobawofoj.pdf
    • http://thingsantiquesla.com/userfiles/files/18704993818.pdf
    • https://seltec.io/images/uploads/files/95854157128.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139223020aae---gutakolil.pdf
    • http://newo.ru/files/files/boferomopadedaj.pdf
    • https://grouptm2.com/contents/files/jedodi.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/titebumusolonirefikutus.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/38087824921.pdf
    • http://dpholding.ru/uploads/files/buvumajatigexi.pdf
    • https://artistprasanna.com/userfiles/file/40632281204.pdf
    • http://vamaconsulting.sk/userfiles/file/48910654504.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+telefonda+internetsiz+radyo+dinleme+program%C4%B1
    • 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_off0000d114.bin
80cf2ad156f97b3afc988272c55593e0921a9ce2b019284f4756c85141bb2ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 11044 bytes
font_01_sfnt_off0000ea90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16792 bytes
font_02_sfnt_off000102a2.bin
d7932f2250c8bdcc2644938b544c64f8fc35eface730a0a7b1c4f522fc676199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 17756 bytes

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