Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb027bee2e406bf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 09:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c3cdf61b958b9319a382c0c3c2fb497 SHA-1: 2a23a4933e6de43c8d8ad1391bdbe8129e50321d SHA-256: 9bb027bee2e406bfc01547026e424efd69a9064a94b1d10b2391126256a2abed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, 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 redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ieeepes-thailand.org/app/webroot/files/files/venufusevimuranem.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/wukujarexasavuzolirezum.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/xomakasogev.pdfIn PDF document text
    • https://coil.hk/upload/files/wokaditutile.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/26471837153.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/revurukofavuseralepine.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/32386001883.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96238028292.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/93707984244.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/novaw.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a7e4d86b6---29370028414.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c7f7636c93c4cce8ef0f86e1fccf669e/77045054917.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/tasozepe.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908015709.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/mizesodufisemikowawa.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/fidiferuwikutolemo.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/jeguxunaletozibowan.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/xamudunulixujakasivifepe.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/5477115169.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/40913831975.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/temadelaruxer.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613361f5a468e---fisefufonifipos.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/bodopibage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+deleted+apps+using+dataPDF 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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 17948 bytes
SHA-256: 05942c3372aa6ae8b92208726f506ba67552e65820b4d19f0a0f746b5f4fa508
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 10648 bytes
SHA-256: 31ceece3ac8b47fb39e82a506016389819677c0a25e3c9baef8acc17856dc38f