Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1807c835ac342b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 12:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d732e044f5a4bf35db43d1784779041 SHA-1: be610c808e726a856cd0e386e621dae26faff7d4 SHA-256: 3d1807c835ac342b0b32f86f3dbd2683e0ccd2d041f119438d6bc77a824d3692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

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://sgrappresentanze.eu/userfiles/files/93380062036.pdf In PDF document text
    • https://curewelldiabetes.com/userfiles/file/10738526722.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wuvivemidupixadimutamud.pdfIn PDF document text
    • http://risme.vn/files/87730585099.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/lojim.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/famudope.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6bk1vf8u6a3unifc745etiep55/garezu.pdfIn PDF document text
    • https://12shio4.com/contents/files/tidudivu.pdfIn PDF document text
    • https://emenu.hu/editor_up/14336838302.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/sikogujefazukidesufuv.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/mozisirejog.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kavodixasevu.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/7589325497.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wovunovulolobobe.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/nimufawir.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/66777637076.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903032345_z27uu3.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/19350015351.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/33219819150.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ad611f4ff77a2b38850ab573a26714e4/nadarinorokojinopavipulu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/likubetukurup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+transfer+data+from+my+old+tablet+to+my+new+onePDF 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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 10848 bytes
SHA-256: 670be7dc951eb08ae16846738ab619d1aabfb8abacfb105fa73f24e3a75ae8d8
font_01_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 17688 bytes
SHA-256: 8c9442ee06fd5b9789a58965b70bb9ea3fcc50e562570d4fade0bd677aa9eada
font_02_sfnt_off00012d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1