Malicious PDF — malware analysis report

Static analysis result for SHA-256 35642bb56de03bbe…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 19:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88b00308d8fcff5c1907a1786b5877c7 SHA-1: f6e684b55411e799e1805a7b193a3f7bd01a91e5 SHA-256: 35642bb56de03bbea6582e7aca25472cba2a6f42305668f57e55110cbb89adb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable domains or are used in link farms, indicating a phishing or redirection scheme. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://computerzone.pk/file/kinixewajuzomaros.pdf In PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/vofolekuj.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/67676713347.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/36539861652.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/witisufevokapenakom.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/ridakukagixopomafew.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/61292529706.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/44482075778.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/93158031794.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/kiwadujutetefuke.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/95485715781.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bawutanogugozad.pdfIn PDF document text
    • https://aashianarealty.com/file/vomudexik.pdfIn PDF document text
    • https://signika.pl/Upload/file/81864091484.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/75155474163.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/zinakofuxa.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090513295073499.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/ginovafolifelesuxi.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/tolorajuzenomexe.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7371f77ekorng9spgg0toel9fl/zegoniwafup.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/45919203796.pdfIn PDF document text
    • http://zenkatsu.dk/files/64213112325.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/38326880369.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wakoraxatu.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/165492813861450d0a9b880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=videoder+music+and+video+downloaderPDF 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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 18096 bytes
SHA-256: 7d56ae93baa45daee1f3449aebd74a96ef846c1637ce7834e9d10ab71eb2db91
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10652 bytes
SHA-256: 4e18167272c46eb8c36a4ab214e47e150f081b907ae41bdf77c02808fc2c91a9
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1