Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48bb5d0b6132287…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 10:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5daae4e508f0349d67dcd886795b795c SHA-1: dede60dae3eeb907cfd3e1dfe120d1bf60c3a096 SHA-256: a48bb5d0b6132287988757a64d1babe948a8d3bca3fb36025f8c3aac0fc52123
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious PDF files. The presence of a 'utm_term_redirector=True' suggests a deliberate redirection mechanism to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gzcil.com/uploadfile/files/vugibojiketaxilafivesovas.pdf
    • https://brakos.it/file/zerowo.pdf
    • http://centroolosprato.it/userfiles/files/89522323704.pdf
    • http://dulichtantai.com/files/uploaded/files/49602321597.pdf
    • https://congtydaihai.com/upload/files/sitevo.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb27793bad---kawidasolijisuwalat.pdf
    • http://suyogmaratha.com/editorimages/file/59828294602.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8u94s4mggq2ima3c5mhqco7pe5/tewiwugomulufufod.pdf
    • http://dailymaytrogiang.com/userfiles/files/kekun.pdf
    • http://yeongwonenc.com/userfiles/file/zifin.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/depizafosakapin.pdf
    • http://architettoangeli.it/userfiles/files/44835831195.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/sorusedunuwoxe.pdf
    • http://www.petersonassoc.com/emailimages/file/nadezajeja.pdf
    • https://avistravel.activsport.ro/userfiles/file/30271089657.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/pexolusiforewavev.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/jibukemibujifudiroxosasu.pdf
    • http://biblioteka-belzec.pl/upload/files/mawomaw.pdf
    • http://fc-junajted.com/upload/datoteke/43909743455.pdf
    • http://ocean-ex.com/images/blog/file/60597975685.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zoboxagujijufuzudimixut.pdf
    • http://ohana1bbq.com/uploads/files/zivuxawamo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+icon+file+type
    • 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_off0000b374.bin
07d324cc7db5f4b953282bb3ae7e10cf591d08c797c1da71e5b12b96e87f7903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 17120 bytes
font_01_sfnt_off0000dfa0.bin
01cf266585fd7dce64673104ebade6fd0532946869497774d13eac9ea4860bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 10376 bytes
font_02_sfnt_off0000f732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes

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