Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d6dc8d3c85a4ac…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86d4657270459953101f01325f244d9d SHA-1: f11b2bcf12c45093709e771790de32fd474770cd SHA-256: 50d6dc8d3c85a4ac483ed7908cf62068beaa11f3b8a011f28110909b6c37d87a
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 for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

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://smidgel.ru/uplcv?utm_term=game+gundam+apk PDF link annotation
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/momisonizafogajur.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/81830434646.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/vutavomopodesotared.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/piteputamozixe.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/rotuzoluk.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nenakuvenedepuvakupof.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/76269400698.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/lijurovusalowalivurujop.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/86673245831.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/73079220275.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5498471622488d23a63dbcac498a1fe2/95009833028.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b175f650---nazefibaxirakiso.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/34658632808.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/binete.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/64772291909.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/45030336917.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/51209026269.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/pinotijotawepa.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/xowagelijoxiwopumet.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zopawike.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631015142.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/62969758868.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/28718497678.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/40994751744.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/7483108979.pdfIn PDF document text
    • 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 17224 bytes
SHA-256: af16f5998745841613a4dc76e02549f3f0fe4563809b88c45a414105a62fefe3
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10344 bytes
SHA-256: 7e13161044ad35bb45e4de98ecc2527095460627bf7595613c064fc7520b836e