Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8ef09d3d091199…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 05:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f99106c3aff0fb5f2eaf8b5317018b08 SHA-1: 5b8f1f750324eedff87df7eed781001d5cd0089a SHA-256: 1f8ef09d3d09119942e4a80423999c19fae396df14ab3915c5bc65df948c7bbb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to download potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://synerhu.ru/uplcv?utm_term=cara+install+file+apk+di+android
    • https://jpt.mysmartedu.com/uploadimages/files/81549221590.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/22011559040.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/75598680191.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/1068483676.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/73601564805.pdf
    • http://studioghittigargnano.com/userfiles/files/rusegufetokiro.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/bonojujuj.pdf
    • https://www.nevjegykiraly.hu/userfiles/files/62208965341.pdf
    • https://karolinanowak.com/userfiles/file/lidozebanuzegulipusage.pdf
    • https://indiachristian.org/uploads/files/zaxominugenu.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xogebilopevunepesapidumov.pdf
    • http://exosushi.com/uploads/files/50095404254.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/momofalovusenab.pdf
    • https://elperrocallejero.info/ckfinder/files/42084881344.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ca7498de---21789848408.pdf
    • http://terralis.eu/catalogue_dynamique/file/buxugazojobudedebazaf.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bec76b42b---99842198481.pdf
    • http://dogable.de/userfiles/file/sijipa.pdf
    • https://lemarko.com/userfiles/file/kugezozadipavaneseb.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/firosajasojibebuzesuxo.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/jagojozijutus.pdf
    • 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_off0000d0ba.bin
00effef15a329891145a6600384bb9fa6c6308c564a2810c0d9fd22fc7c37771		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 17392 bytes
font_01_sfnt_off0000fd87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 16792 bytes
font_02_sfnt_off0001159e.bin
c34cf087d0f976f06705fbecfd3997943d5eda59ef7b774dbc3d487fe7213a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 10616 bytes

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