Malicious PDF — malware analysis report

Static analysis result for SHA-256 15de41bce75ad063…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 13:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ac35627529b66cddad5fac3eb85ff4a SHA-1: 5fd2617d7415cd88d5ad3e96f5020e18c2471098 SHA-256: 15de41bce75ad063e0431a70a146a7ed9e62309916a8e238737572ad2613f3e6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristic firings indicating it is a malicious link farm designed to redirect users to external PDF files. One of these links, 'http://lucidareemantenerepavimentifaidate.it/userfiles/files/nelol.pdf', is flagged as a random URL, suggesting it hosts a secondary payload. The ClamAV detection and ML classifier further confirm its malicious nature, likely involving a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://olterus.net/contents/files/67844360190.pdf In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/54345514680.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/81857702263.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2c72d884---jibinaw.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210919012029.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/koxikadinozuvapujaloze.pdfIn PDF document text
    • http://saktigroup.in/uploads/38585148028.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/danuzusat.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/3099098332.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/80799151874.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nelol.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/14426395079.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vagigaluzuratomusabux.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/jazujipesi.pdfIn PDF document text
    • http://totoumi.jp/upload/file/47194767473.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/lopularonadazudejinaw.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320bdc9c192---kafugepiga.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/37488397096.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/63761731545.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/putinifazokunelow.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/sinumekotagagusedana.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/vubogoralupulozuxo.pdfIn PDF document text
    • http://slsnn.ru/content/file/32527761669.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ziwutekivofodedawudaf.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/2361818019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=iic+vs+spiPDF 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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 9624 bytes
SHA-256: 18821da49f999080acfd7eff8967a6632b10267973499b511e938f9ff17ec1d8
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 17640 bytes
SHA-256: d8348e6e9f4069f7b95548389304f0c25cb4bcd3dd3ce0fb197e4e2d33c74df2
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1