Malicious PDF — malware analysis report

Static analysis result for SHA-256 73122bd7037ea87c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 00:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8175c53ef5527ee4756174acf589052 SHA-1: e20087fa99f510d8dc7645195ef7fa74c05a49e6 SHA-256: 73122bd7037ea87c5e432744ababb9d9c890ce100d344dc10602b759554e02fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The presence of external URIs and the link farm heuristic suggest a pattern of directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rosesrealtyhomes.com/userfiles/files/sufeturajoromedinupejapo.pdf In PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fesirezizategebafofek.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/68819294085.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/dubajakaturelikudo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nukete.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/44568657056.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/danalilejil.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109090633575071.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/28458401564.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vbpvbl0ehii2tesnsqaj6aeeph/fogunokuzaxepire.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/1962040591.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/99093856173.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/ruxede.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/26897360755.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0fe74249---70592456834.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/titodokusen.pdfIn PDF document text
    • http://ranchobg.com/img/file/jusodemazajo.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/55234780078.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/jalofojili.pdfIn PDF document text
    • http://deforma.it/userfiles/files/38922255586.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/wasakizojupumoreweniza.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/luridasigezoxujid.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/mavaredidana.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/57428515760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=power+vs+force+book+pdfPDF 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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 14896 bytes
SHA-256: 3a377f117b6a404a110c0f0bab12c811aeadad1d776cad958f9de4cb3bd5fc72
font_02_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10496 bytes
SHA-256: 1461b154f44bf98b8fd0fec68419f62e4ec852bc74e0ed8207dcb1715e60fb8e