Malicious PDF — malware analysis report

Static analysis result for SHA-256 943df841c7f5d93c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-12 14:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e7345ad2a6fe1ac450a15fcd777fcbb SHA-1: 7dc30aeb570a0cc3ab263b3b69e9f7c0972843af SHA-256: 943df841c7f5d93c2ff087fb37136908a37ce2fc6a5516ac4f6518b471ed678a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to redirect users. 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 URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dominant.name/userfiles/file/15191596294.pdf In PDF document text
    • http://gndpta.eu/news_objects/files/kelizi.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/xezivelafuludajijomikeva.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16311589811364608451.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/42117004090.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/99462821890.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/81742257031.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230be16614---35983445391.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/nafufut.pdfIn PDF document text
    • https://sharenkon.com/files/mepodunapavapugisarudetoj.pdfIn PDF document text
    • https://brakos.it/file/bomubosa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/83d3114b54adc48fb1a00216521d2d1c/70944938973.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/33291835895.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/73615923337.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/12212017590.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/pamelano.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/divavigenazotenigepig.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/belazev.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/dakenelamugobi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/farujogojovimidosevara.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenora.pdfIn PDF document text
    • http://mopron.ru/upload/files/fopitofexid.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/kuwiwafes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mi+note+10+pro+super+wallpaperPDF 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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 17508 bytes
SHA-256: 55caf8f9602b3cf10d185264c46817d7a4e6ab4b740f83c28645dbc7e19cb7a8
font_01_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10596 bytes
SHA-256: aa04a5097f81740934d574596ada57410a7383dca2f7a3a977e341c0638444ce

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