Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38e804c4d8bd268…

MALICIOUS

PDF

82.2 KB Created: 2021-10-07 00:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2ee8789add5809ab3de10af2329a7909 SHA-1: c0af17239b046c9f839f5fbed58c39288e36d901 SHA-256: c38e804c4d8bd2684a4113cb35c42aefafbab5df28dec36da4944f21537c8455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ty6600.com/userfiles/file/dimaranad.pdf In PDF document text
    • https://rajaketiga.com/contents/files/delatefozumegabimonikazig.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/58409981502.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/kiguvavedefebikemupomovoz.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fubatej.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109162110468205073guhaz.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/siwudeweratixatavobexop.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/digomowefironobudoxuzoxaw.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nunedogoxotevamo.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902164810.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/78705474239.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/vonelamululi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rexonovaraletukof.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/taxedowutadixowupirozanop.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/sulidixubezemimagurulijik.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/60601325627.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/pivefenedoterodedonobipa.pdfIn PDF document text
    • http://capri.lt/userfiles/files/dilabakoxo.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/15804161601.pdfIn PDF document text
    • https://itscebu.com/upload/file/20211002204638.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/13857489704.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/18525422953.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39004116314.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202192715984731.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614151f1d4631---45082919639.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/15640049341.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/neraxofilulizavafuso.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021100419464457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=why+sales+at+byju%27s+answersPDF 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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 17948 bytes
SHA-256: 0c90746f928d3730b2358e826bb41ef3fe9dac5f0429c8c8b79738603f55e4e7
font_01_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 10588 bytes
SHA-256: 0f898309abb98c6a45c6c0c325a1c702df3b48e3b77a0f010bb7324ebeb86517