Malicious PDF — malware analysis report

Static analysis result for SHA-256 600642d94e95bf6b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 17:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 724b4fc12d362170bebdea8e718180ca SHA-1: 46f2a9bef23542b9efd16372e6aa95ea68e23a93 SHA-256: 600642d94e95bf6b55d55f35cc244db5808c0418a8c34d137054300dd88c6bb1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://planet-for-events.de/userfiles/file/45310290278.pdf In PDF document text
    • http://specialcats.nl/media/files/36289462097.pdfIn PDF document text
    • https://seikai.jp/free_images/files/64159158769.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904195740064616i6h7gd2j8xl0.pdfIn PDF document text
    • https://tekmaker.com/upload/files/zexegawenosejidixut.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210902051205.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wapaxibebutarefilusiv.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lijexivij.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bonogepilunifasopi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/midol.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/94942609193.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/lugegotazunidar.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/xoruxa.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/viximikabobakuseroxorav.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/68828836292.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_101758_4413.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/6715627769.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ef3b40e7---kapuxurumajepuvo.pdfIn PDF document text
    • http://zaiger.ru/img/file/jadomegepejamegimamoviba.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9e338d47681c49654e136079700ba531/37646596951.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/tamenujivojixetukowe.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/gotufabazisofizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sims+online+androidPDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10384 bytes
SHA-256: c7a17643d8f3c71afde17a307c3fa7a61ca38cd90a2e5fc7762256a3e182d0a5
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 17280 bytes
SHA-256: 6116f9788aa59cf2e9f852d1b4999bbc400694eb719e95ea3a07ead7ab3c7a9e