Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa58dc1192c16f4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 13:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af4681fa5638d4fea757161e68495e48 SHA-1: fbc358527f7b927c95a8518c30d2958546d83410 SHA-256: 1fa58dc1192c16f40ac1d0b3c00b064eb40f51919988211388c7b02fbb54829d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://gcoekmr.org/cukashmir/User_Files/imagefile/tiboripetifix.pdf
    • http://www.slappedtogether.com/editoruploadfiles/file/44980015789.pdf
    • http://www.aportecnica.com/imagenes/editor/file/68891090744.pdf
    • https://griby.biz/ckfinder/userfiles/files/xowotulefepixidamekosed.pdf
    • https://genia-groupe.fr/images/files/xifarokevi.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/40990540073.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/15273595405.pdf
    • http://oldstat.ww.tj/img/file/vapijoxotonefezojosoj.pdf
    • http://security-m.jp/tool/images/file/12910384054.pdf
    • http://tycoonmedical.com/userfiles/file/63388125483.pdf
    • http://kerrya.com/ckfinder/userfiles/files/34571638708.pdf
    • https://mamap.in/ci/userfiles/files/74296540717.pdf
    • http://zerosquareonline.com/file/61315979659.pdf
    • https://nurdagihaber.com/resimler/files/71218028556.pdf
    • http://195exim.com/datas/files/pakigedoxetaguxiworeza.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/857243b8626e935f6287461ab61a16f9/lapudij.pdf
    • http://denprokhorov.ru/images/file/pewafirilimamanuf.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd52ed9fa---julovupomalajoriga.pdf
    • http://bassonconsulting.mc/userfiles/file/zuxufemiwixigulul.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210904090421.pdf
    • https://oncetrabzon.com/resimler/files/nozizatu.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/sosezaxiwete.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/19990291724.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+amazing+spider+man+2+full+movie+movierulz
    • 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_off0000eab9.bin
21aa49933f001fd9342a000a778e77c3637927f2fab489793cccdd8991fb51c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 19448 bytes
font_01_sfnt_off00011d51.bin
5d286db5b3a89203b339e40840490def50b7cd42ac76ff97da71a773640fa20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 11156 bytes
font_02_sfnt_off00013709.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 16792 bytes

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