Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c61cd9486b3b862…

MALICIOUS

PDF

77.5 KB Created: 2021-10-09 00:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: efc63b5b17f32f0c1741970da7eac6cf SHA-1: 535c60142bfa1586e83ebffcf3b738cb5d4bb9b6 SHA-256: 4c61cd9486b3b8621cb2be1b6f9c3e851746fe3e9e8355e42d79d3df73ca5f48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

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://mxagproducts.com/upload/browse/file/dafidi.pdf In PDF document text
    • http://surmounttravel.com/userfiles/files/58780635284.pdfIn PDF document text
    • http://bresky.cz/res/file/jatonubatewogizimawusulop.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/55764792667.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/97101891466.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/fosojesorividuxulogiriv.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/mejizebul.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/71162433069.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/77608503918.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/48885767930.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/vurezaxogab.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/4179889743.pdfIn PDF document text
    • https://alutat.com/data/file/63049012016.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/8098969504.pdfIn PDF document text
    • http://domplus.su/userfiles/files/13324816486.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/zazal.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dotebujofolof.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/61947083593.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/19261922546.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/77138947808.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/69661353258.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jajowo.pdfIn PDF document text
    • http://metallpress.info/files/podawavowop.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/85325806884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+name+of+ariel%27s+dadPDF 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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 10644 bytes
SHA-256: 687b8129fa87cbb859e0d1ebe1f2d9ebd78938ba256c099a8ce3a4af5e982ba1
font_01_sfnt_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 17872 bytes
SHA-256: f809f5711b405f1b00d72c5b09f96ad21557a12ffa20c28c36ab5358147f9f78
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1