Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d05e41f5889cb0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 17:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c60aae0fe15c8d4c21cfc77847c1969 SHA-1: d50808b78ecce05d9bf6a81a9d622f8fa4119f44 SHA-256: 38d05e41f5889cb0d707602759e187cec8493ca2d63960ccac23637b2753d6a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://strahyi.ru/images/file/jokitugotoji.pdf
    • http://kechengchem.com/upload/files/laranob.pdf
    • http://mascotdd.com/file_media/file_image/file/xulekevitiz.pdf
    • http://fosterfreezesantarosa.com/uploads/files/sepototorafodosikedileto.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/54673679407.pdf
    • http://sakem.org/userfiles/files/62483049856.pdf
    • http://sinhorelli.com/userfiles/file/7151046371.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/50452724736.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/gujafekitalikip.pdf
    • https://artistprasanna.com/userfiles/file/luvolikemezesidewokasut.pdf
    • http://masan315.net/board/imagefile/file/67984445204.pdf
    • https://millinerandassoc.com/files/file/figexonumebikerezilodube.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/nedijapixinosobimuxidi.pdf
    • https://wsbtitan.com/images/file/69521650398.pdf
    • https://tonymusic.se/UserFiles/files/simugodovipub.pdf
    • http://ttlh.vn/storage/ckfinder/files/16916266629.pdf
    • https://mytalk7.com/_UploadFile/Images/file/36278686383.pdf
    • http://uklearningnetwork.com/userfiles/file/34963952660.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/9388696750.pdf
    • http://bananamusic.tw/uploads/files/202109152353446461.pdf
    • https://bititechnika.com/uploads/file/fasulivi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd713bd65---27900745964.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+5+specification+and+price+in+pakistan
    • 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_off0000da19.bin
306404617a167ac782bbfb4cc0bb88ebb00c464be7a15877231374a6015254de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 15616 bytes
font_01_sfnt_off000101fd.bin
bc59bf744622ce7b04ff72ddbb02f3054de30e0e5b9642053e137d528a9d7254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 17804 bytes
font_02_sfnt_off00013085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 16792 bytes

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