Malicious PDF — malware analysis report

Static analysis result for SHA-256 faad6bc4fef03494…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 06:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fe10c120c941d48e4c7f52f2f89bd031 SHA-1: 14598fab812967b253931ff0521d0942465bc473 SHA-256: faad6bc4fef03494a0a57cb7a32b11231959a805a7682f8cccf9e7ca727e5a44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous distinct domains hosting PDF files. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://karlsbach.de/userfiles/files/64661408948.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/files/jafoxarijaw.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903194321.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vudafinuzotizulimekitojul.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/77576109376.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/rasizimiraxunolikudafo.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/borozemaginuloper.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c7b6ed6d---55504252914.pdfIn PDF document text
    • https://campermagazine.tv/public/file/dizofufijopizurabumugufu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/lolikovededugowavevi.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/9172651910.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/nesirasuvixatos.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/najizezaxilo.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/60006685571.pdfIn PDF document text
    • https://videoeffect.ir/data/file/bawejet.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/damenejisev.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/78723b86aa9bab313e888f888e07dc4a/zedug.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/giforuwun.pdfIn PDF document text
    • http://zimmerei-possert.at/lowexewovojetot.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/4881076234.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/xedigawafeto.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/46396816852.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/xeral.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=live+wallpaper+maker+freePDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/13923310377.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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 16956 bytes
SHA-256: acf24e6c73f9897d0ff9981121174bffb5caf7207bc75f648739556bfb95bac3
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10232 bytes
SHA-256: 33f15706172d25a00b98a479d7ce254159344b629f5e646ea72bd4b24a68ddbc