Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91132f5633f1843…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 20:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e084550ad335de9ec86699cf04462fa2 SHA-1: 75adb83b9dfd44045ff845a63d4070cb1e7d63d8 SHA-256: e91132f5633f18432670884ae6c4ab306be21d1e18f44fc3e354f08142f7f68c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://sindhuinvestment.com/ckfinder/userfiles/files/bujukamivuzofufufegumodo.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/78990031067.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/noxavekuzida.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021911142591782.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mefir.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210922190210.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/7450410902.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h46he6qkvvhr9tnsfgcgonb7bn/12710989305.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/funivewufetuwesujasaxiba.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/35969621999.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/86547576812.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/6502120944.pdfIn PDF document text
    • https://grnca.org/img/files/files/67663292125.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/vikiwibesisodod.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26076547878.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614817b091208---54043882788.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/333231825.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/41614674857.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/todosowabujevelis.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/weruxegubuvamadego.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jagasoga.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/39670487730.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/21130555921.pdfIn PDF document text
    • http://schokobrunnen.com/idata/29242794976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=root+apk+android+9PDF 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_off0000aee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE9 10344 bytes
SHA-256: 496c82ff35c3ef24ea0acef00dec631a38c4149c85b3f9d34d39d3bbda336b0a
font_01_sfnt_off0000c662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 15428 bytes
SHA-256: 56319fc5ac4e730080417d5b7f3c002092b82ff6852540ca01804f04e7a70c61
font_02_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1