Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d5c27f7d9628cb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 21:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bc0da4e5b2f9676d6b09ffd85d2d9c9 SHA-1: 50df8c4ac31dda363a3263d18973c01c8c48451f SHA-256: c9d5c27f7d9628cb7a47037c671f8d401af831b8f6592cf54a67d24ec88133d4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://multi-accueil.fr/ressource/site-image/files/83528176153.pdf In PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/zofimikejuwiwiseperujeb.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/16544690719.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/67530291888.pdfIn PDF document text
    • http://onlinevay.com/upload/files/bozedugumum.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/jaxonegogavajogef.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/99341801513.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/75166801570.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/wipetotokeke.pdfIn PDF document text
    • http://drtamerturan.com/file/jatojun.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/64751988608.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wasaxigewitetuxa.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/35603194431.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/gaxubolozapuwuroz.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/69063410114.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mapukexisizajujuf.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv8tmkqoq1pvkbr3huqplpb4hn/rukeguzomisalekajipixu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/buwirerirapoz.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/08d0db3ce5b29eb70b4557283c23162a/41900928068.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/gavepewiwetukeb.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/gepanubezolugamumef.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/lawumajowilebivulururar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=legal+hacker+apkPDF 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 18896 bytes
SHA-256: 10baf74e73907507b9186de602fece3b448b8f1aab94108a589ec89a69cfa206
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 10120 bytes
SHA-256: 822a3901a4b5a2b34173c28f6dfabb52866dbc13d92afbf23297357ab3fb7eed
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1