Malicious PDF — malware analysis report

Static analysis result for SHA-256 38427a9050364e34…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 12:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bab019c3ec43f3dbf0ae12df80976d54 SHA-1: 514506ea0525634b26b74a3f8305901a9dc8a3c6 SHA-256: 38427a9050364e34b49d6d0df4b27368ab74945f166e8ba921414b6bea786589
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=how+to+share+contacts+from+android+to+iphone+using+shareit PDF link annotation
    • https://10s317.com/uploads/files/202109081834156812.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1b1b67d0---19387144109.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wezovuv.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/kigazisoxuxak.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/48008923210.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/1430203262.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/rawifanizubopop.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/22625479268.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/kixakoragubi.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/kivuruwalijadupugaxigu.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/razovurozesi.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/39255612180.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/97309498373d78064f04e6f1a6777426/57613695077.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/58595147061.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/tilugudubokitefev.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/18164472090.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/57553897859.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/biwudugeriregade.pdfIn PDF document text
    • http://intersonik.eu/upload/files/wularapob.pdfIn PDF document text
    • http://gibisch.biz/files/files/2424495437.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/zatokaji.pdfIn PDF document text
    • http://minhanh.com/files/71331037283.pdfIn PDF document text
    • http://vititanon.com/user_img/files/48791203351.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/10891979746.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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 11200 bytes
SHA-256: 484112204d9484d65181cec2c362886ad5689f105b60a95f10ee0ce903ffe989
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 18256 bytes
SHA-256: ef26a590ee171785f12998b9ec198772944e66376fcad4fd9014febe678e4fc5