Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec50b248a91878dd…

MALICIOUS

PDF

77.8 KB Created: 2021-09-23 18:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa6d3fffce39d21eef2e28c488d2ce5b SHA-1: 6820780afc774dfb0dcfbeb6d0a0b2ec224c0dbb SHA-256: ec50b248a91878dd2d0e6f1f26f2f11948caf4c68911a5a2d2e5d6f08e0c3801
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs, suggesting a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=free+robux+hack+generator+2020 PDF link annotation
    • http://stensoproject.com/userfiles/files/fozek.pdfIn PDF document text
    • http://workontext.ru/media/file/80870841225.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/90389301986.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328fcb43bc1---sarasa.pdfIn PDF document text
    • https://membermimpi.com/contents/files/12733865969.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/xijekijixajodupo.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/51279325469.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/24806106158.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/67045961528.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/61660815382.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b204f9c3f3---54672746805.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/nibidovajexol.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/mikuvaluxotefudabubot.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/bujutovemorowefoxu.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/99666370944.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/rivefubematade.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/milapuriruziwajigogutege.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/70489261455.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/dogeturig.pdfIn PDF document text
    • http://ternovykh.ru/content/file/tozetulogepit.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/37931280166.pdfIn PDF document text
    • http://jsdarvin.com/files/dabemovijafot.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/40086577251.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/4905246758.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_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 10856 bytes
SHA-256: d4c22791710172e4aff9aa00bd510ebdb2dd104f44d446651c869ca2df9b6a80
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 18028 bytes
SHA-256: 808c90f76b0002c027bcddd01baeaf56cad1e6a29a9107b241c5f1911c211d35
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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