Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d14e15d2b0be3ee…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 19:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0dd0d72db5904880cc93ad385e1df0d SHA-1: c0f1ea17669d94d5c669f1141150dbbfd909005a SHA-256: 1d14e15d2b0be3ee61ec3482ed05287f96ad6f261062fdd6b5461eff38247ec7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=mac+preview+invert+colors+pdf PDF link annotation
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/zilopuzazamamadogek.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/36064217247.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/momibadejolezegigow.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/95263035939.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/69882658512.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/maleserakalebar.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/vikojafigexez.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/zowapojuwefuxape.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_A0F722B9C6DC75E0.pdfIn PDF document text
    • http://pinxedien.net/upload/files/18086930438.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/zokofiwinozinix.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/42408961687.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/71906301107.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/63526507309.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/fanexuzusidid.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/nusales.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/tagem.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/jafefikitozitelawagareze.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lisikevixomuga.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/todud.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/62636834493.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/51944670536.pdfIn PDF document text
    • http://ranchobg.com/img/file/25400597901.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/14978846727.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/volatelasojufi.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_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 16576 bytes
SHA-256: e39f6484a3e51d2b2d9a8218ede21774045bdc05725ecd13b9e1d8d99233eed7
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 10760 bytes
SHA-256: e1c194121088d672d7eaba320616b72e700ae6213713d4d89acc0f4354e5a7d6
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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