Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb8cf010f7e46d2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 21:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19ee8b72490e7c6cf7ee3a2ba9376b5d SHA-1: 7f244f56fc38588eda431ca7726bf2d60b67c8ff SHA-256: cdb8cf010f7e46d2b0a63604bd1b3dc282590f5d6e2743942d6f09b133321b15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow, potentially involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zdrowejaja.com/Upload/file/44577890314.pdf In PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nutapunavuzebavurabek.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/28807663511.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/turonokujizisexu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/32516411320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ddd0e861---12271623232.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xoduzokukevagopasof.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109080803375979.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fidonidi.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/1874189375.pdfIn PDF document text
    • http://pneusmarene.it/images/file/16629215538.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/84913858209.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vuretividuduraz.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/xedubozapiruxaj.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/suwawax.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450e65254e7---35094033773.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/jaxuparatujosizarafa.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/nurojivubed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+fake+location+on+grindr+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/44767021691.pdfIn PDF document text
    • 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_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 18824 bytes
SHA-256: 0446287d488d3042722ebb9ff834aa1d6152966229915ab91a379de49a2bfd62
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10652 bytes
SHA-256: 533dd6f1ea9056c49ffcf6caa4640df881d56f46d12d3cd28cf2ba5145c48d28
font_02_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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