Malicious PDF — malware analysis report

Static analysis result for SHA-256 23270878aa222c85…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 00:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c5c7ffaddedcdd3067153f9e3f786ec SHA-1: bc7aec87f2ff5a9a4d21eac3e1c0ce38841032dd SHA-256: 23270878aa222c8556b29632706bf187c20421bb33f5aaa0647cbb8af3ae68cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of these URLs strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=yes+day+online+free PDF link annotation
    • https://icon-studios.com/userfiles/file/tuxoligiwur.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/94141363538.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/tejupiwev.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/24561953923.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/kimujijiwudulalu.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/64207306852.pdfIn PDF document text
    • http://airmon.hu/images/files/19189069432.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/jilokozorovamido.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140494ab5f50---kuberofawawufim.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/53148050528.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/dotesetawuzonuxiguxa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/78554056240.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/95210492778.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/pemalajeze.pdfIn PDF document text
    • http://toonesk.com/upload/44524942122.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335efd8be3a---rutidujelujazorujezibole.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/bafufojurowesotibotikut.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/32652329583.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/sugovagizobepetor.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/garelojunudomonumefi.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210903061320.pdfIn PDF document text
    • https://alkoplast.rs/files/6578160194.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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 16132 bytes
SHA-256: d19b74ca58c4534776c4b4edffe66a9b8aed19e057aeea0218953fc59ceca01e
font_02_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 10348 bytes
SHA-256: 803fe23a21ea24dba914913081634c327f2eece2c6fa1be075c01b01ed3e406d

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