Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae304a74db5e16a9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 02:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 246496dcac083fa29c4cfa317b78eec7 SHA-1: c158562dda2fedc6b1d8e5100c54367d60d32d36 SHA-256: ae304a74db5e16a962223aefaddea37777d3430a8003495991fdf60103f901d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or facilitate phishing. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zibigurunupilu.pdf In PDF document text
    • https://evpersoneli.net/ev-personeli/file/86882207886.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sojekepisavafez.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fafupefet.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/tagapa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9de1ab36---judilogisimagaga.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109191448322532.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161437f7dde995---xawid.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/71982875297.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/83532782657.pdfIn PDF document text
    • http://luatminhnghia.com/img/files/67002425110.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210919_163126.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sawetulijo.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bigarakuwikabolaw.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tefemigefigagebezazoju.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gemepugaguwojanobukuweget.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109121436391938.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/dixatudijilulezixozu.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/vubowovin.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/namofes.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908005955.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/fubezewopek.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/18494449871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+obb+file+free+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_off0000afd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD4 10612 bytes
SHA-256: bdfc3fbcae9efbce311605d710964fd46d255d7e7b239c690bc770f2ca43f024
font_01_sfnt_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 16344 bytes
SHA-256: 29ea0408f821c391aeca6f376417b31cddbac2431f70f849aec6928dbb6cd43d
font_02_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1