Malicious PDF — malware analysis report

Static analysis result for SHA-256 12408fd8f8c31659…

MALICIOUS

PDF

90.2 KB Created: 2021-09-13 00:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d56a4ea49b8d4ebecc459015155c4451 SHA-1: 9eb297e5509141b9edc18ac793bb74aeed11d110 SHA-256: 12408fd8f8c316595d226467a0ce9ccf40cb2bb25d584a91b4c7ceace9f55b22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV also detected it as a 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://metafelix.it/userfiles/files/78007855994.pdf In PDF document text
    • https://sinarwaja.com/account/files/zokowuzi.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/44582799709.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109100915569470.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/82740029887.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210905_F9445CD9B3CD512A.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/87578653776.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/gosatakuwuf.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/71128187911.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vixob.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/94453766089.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/muxibozut.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/varumitujexemewekado.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/dilegonolubedumubosiw.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/48864491593.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/mipujevapetijuximijokoj.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mamifalobevulomexiwakot.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/vaxoxub.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/24436034694.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/xigiselojegisotumowilejuw.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/72051953589.pdfIn PDF document text
    • http://jsdarvin.com/files/texagemufutebevotike.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/21103487695.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/vanodekulab.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/35689089147.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/7599125468.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/28578207608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=intellij+idea+android+sdkPDF 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_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 20160 bytes
SHA-256: b484c278be3b94942cedfb14e44f732cf467f2f067353a2b10d4e2d4c9ea21ae
font_01_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 10412 bytes
SHA-256: b4aa4c2dbd9546fc2e3bed3d32319544ab70d1411dbdff2ae559d0313c440c61