Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a944d5a557f4fa…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 15:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68cdad33a41d21d330aea259672d46f7 SHA-1: 9983c55b0779eb951b0f1f1e4c7be2aaa0b91fed SHA-256: a7a944d5a557f4faa4c7eb395d8a4013781d83b40c3151785c84cc0a5c849210
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to suspicious domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sangtaoad.com/uploads/userfiles/file/kubamuwupole.pdf In PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/mujevudir.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/difuludotixugesisutetel.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/lidivoxisozufuwere.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/xujufavubarofawududibu.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/92184216433.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/95107013733.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zonulugosapoz.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/dipaguvazorerefewelenizu.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/duwejanosulajoturoleg.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/84965327045.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/71627144150.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47a1b36f3---lewamitomeridogi.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/3874421133.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/vifodatabodonolajunoxojun.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wopabebozawadat.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/wulobunumilinajavis.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/bixaxigewafixemivutoj.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jigafopogake.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/gulalumobu.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/60037142136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+settlers+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 18644 bytes
SHA-256: 92ce4c5581b37ab7eb3e77432c7af88e876518d0ac9c6797a7c41bd518bd1e35
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 10308 bytes
SHA-256: 2914d8cd1b1d42ff9a2fb2692b64badd99b7d0434eb1d692fbabffa4a2a80da2

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