Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cc389a0829edd2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 04:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c64287640265e38040be3f34001a332 SHA-1: f8d540f2707067eab96e37f72b2d23e3e57a15bb SHA-256: 96cc389a0829edd23fe99fbd98060df6d2267e39dad2520761e57bae94ccedca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to host a large number of redirecting links. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://phupmirpol.pl/userfiles/file/31935087873.pdf In PDF document text
    • http://vicc.huh.hu/UserFiles/File/75812458919.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zeduzusunovod.pdfIn PDF document text
    • http://poliinc.com/upload/files/13790294538.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/45669269213.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210908215438554.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914072109129897.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/sukozu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/31769411873.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/dojojupilemu.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/dubikalinaguvuvobine.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/vuwuxupo.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/91032135681.pdfIn PDF document text
    • https://tavio.ru/files/file/3530933855.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/fatowosugakozajiwagub.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/92941117388.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/debominewekufifaxuxe.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/rupaxenuvagutiwibo.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/xinuwa.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jefeweredusopofegare.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3beoc7gb80e3nnqahsdg5f26uf/64438902130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+monster+apk+downloadPDF 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_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16748 bytes
SHA-256: 74a6c7d982a613a7c631477692f3627b51c17b8582efd9a3e67da31e5da59814
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10640 bytes
SHA-256: cc63bf77529fc9a12234ebfe44ac7af1d36480216599cebe65c97cc8edf2a431

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