Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c1129b2c962458…

MALICIOUS

PDF

101.2 KB Created: 2021-09-16 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 027ecdfb8cb2fc89187b2da01cd4ecb1 SHA-1: d9700826662dfd88f3fe88aef0473cde00125699 SHA-256: c4c1129b2c96245865f8ecad8f1104a58ad4133949119441ee217389a93fec8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://pistant.ru/uplcv?utm_term=watch+love+island+usa+free+online PDF link annotation
    • https://securitydm.rs/slicice/file/fedikiwejatosom.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/48337977735.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356089890e0---nadoriwaferaxufosusel.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dejumunumaxuzigus.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jififidanijalefiveso.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/fozozirukaxik.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/46677189605.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/53975347329.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/kunisavosibinik.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/60577666346.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/niwabiro.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/remifafetevuregod.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/10374591422.pdfIn PDF document text
    • http://dasbluemchen.com/97902108618.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/xizuvafexaxowun.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/jevoboposomaxet.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16134272a1cc24---gaxega.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/57704968768.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/44614484804.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/sobodo.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/36263608780.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/21241539581.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/jalivutuvoz.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/53348721525.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1asceo1j60ckp3cf1fvd2t1k1o/44728155082.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/40397667912.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_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10732 bytes
SHA-256: 22fa99453dd7e57ad7fcb4b2464ad0eb94f61f127dc3e8d6cc45be1759cb753d
font_01_sfnt_off00013f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0F 18440 bytes
SHA-256: 2d57c20f043278db64f872952f061100ba9a8d40c4e0b10d76b72fa2745b993e
font_02_sfnt_off00016e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1