Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f9fcca324a363a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 15:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cef44e7bbffdbb32350193eda53def39 SHA-1: f0cfb4576970c21ff37ad91466d90f1acfae055c SHA-256: d9f9fcca324a363a2009cb23b63b393ffc0df1d38d896e0a0f7ffa7f0b288680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://driscollandgibson.com/images/edit_images/file/zevelatosarofij.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/palosudovazabitef.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/waseguzeraweji.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/winotepunivow.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/69619670680.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/pumoketagogurilakexosepam.pdfIn PDF document text
    • http://surtek.biz/image/files/20150328_143939.pdfIn PDF document text
    • https://dm288.rs/slicice/file/17973470164.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138836462c8b---19215009385.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/59841429524.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613442e3f16e7---jifowumawi.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/zapekewuviro.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/12612795980.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/benidejinokisumodatixara.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/nawexofubowojogoxe.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/fizad.pdfIn PDF document text
    • http://scarpatti.com/files/66236069487.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/99653547973.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/dunuborotoz.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210907073602.pdfIn PDF document text
    • https://agros.net/uploads/file/zokifidilef.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/dumotixosubajale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pinched+nerve+arm+painPDF 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_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 10416 bytes
SHA-256: 0c189a70b5b8a84d3e0dc610ab1fbc5060491a7eed243863e48cced0886aa857
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16704 bytes
SHA-256: 8e236b1c389098b736d7c01f4c6fee6026b8da1462351915be7cc5ebb4d02a56

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