Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb71d9c8ead7d17…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 20:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7828b4580bb564995f690dae4f1db3fa SHA-1: 8cb2fa93cc90ec676c9afc66e143999cba5aa275 SHA-256: ddb71d9c8ead7d17b9afd33573a42f03430ef8e027e0af8066c270b5aaa167bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the file acts as a lure to a link farm, likely for phishing or to host further malicious content. The document body is unreadable, but the overall structure and heuristics point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/zisuropebiwugelemupa.pdf In PDF document text
    • http://boston.pl/fck_pliki/file/52369557654.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/39889834049.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/91369406746.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/26266577685.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/nimexiz.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/toximeporuzodi.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/38595633271.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/xenojorepag.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614afda53d702---78416282464.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193160322129.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/roluxugitiz.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/nagawinabawenoferitepo.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/93987152354.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/pobunuzanidelivegu.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/34283257273.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rvn7rorg9kvnunek3743bmvbci/wivetivifigezikarumo.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/waloluwo.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/xijorilemakuramo.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/3874761728.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/11237290747.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/xifefoti.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/bitego.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/94419779641.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/76328677035.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///siwinixogowuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=top+10+music+recording+apps+for+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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16120 bytes
SHA-256: 3dc4b6e3dab6b73db9d7ada998bc6ab5323090bd48759eb39559822b6ed88212
font_02_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 11056 bytes
SHA-256: 152010bdd58673bbe1cd82d94845f4e581ce52375e2912ab71bfc2c9eecb3166