Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e9617e1d6a873a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 09:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22a902ab5ec636208456d9e384855c96 SHA-1: 7e93e679363d819344ab05c080c8c2572ceee325 SHA-256: d7e9617e1d6a873a4c21f6376c06bafc2bda0312becfdc3b66caac8e154f2dec
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF structure and embedded links suggest it is intended to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://klinok-saintp.ru/files/fidafula.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/96660634583.pdf
    • http://gpp300.fr/userfiles/file/19741162292.pdf
    • http://nage-z.com/ckfinder/userfiles/files/49074072196.pdf
    • http://fandimnarodaku.cz/upload/file/zekoxusuzikedolag.pdf
    • http://younewstoday.com/task/userimages/file/potawo.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/86307881018.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161389ef104c4d---wosotejofuduti.pdf
    • http://standdominica.org/files/files/serilusavizep.pdf
    • http://www.benyowsky.com/resources/files/vopotuduvabixibosozulajaf.pdf
    • http://dentherapia.hu/files/file/14527374908.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/89074043035.pdf
    • http://veraschwemmle.de/fckdata/file/85671692922.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/23663904344.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/448696e9e19d431d6ef16ae1560f7e04/46199633414.pdf
    • https://stradatextiles.com/upload/ckfinder/files/fugomoleterorujulun.pdf
    • https://gppacdatabase.net/userfiles/file/xojumup.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/84284873887.pdf
    • https://vicareyou.com/userfiles/file/23103509877.pdf
    • http://liveranigioielli.it/userfiles/files/92482580412.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/nosonumarimitonotonu.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/mudekigilariga.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/devugedorubolixademebaze.pdf
    • http://qualityspices.in/ckuploads/files/divobodigonubutolavug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pixel+experience+nexus+5x
    • 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_off0000bfa6.bin
192a4b1ef9daacfcd91d005bef927db3c92d51e6bed2d64594f999ed70fdf84a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 10324 bytes
font_01_sfnt_off0000d712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
font_02_sfnt_off0000ef24.bin
42597b82e513f60049f9666e3cfab81cfb5fab37cf14e9eb61f2017b112b6be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 17064 bytes

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