Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0e6e91d69801ad…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 19:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae7e1767bb857f863a068b151434d8d5 SHA-1: b901caf899450326bfce03f72a8f69733b3e1ea1 SHA-256: 3e0e6e91d69801add72587b47fd426a6fe1a3975e25c6be1f99dd2370ad35da9
126 Risk Score

Malware Insights

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

The sample was flagged by a ML classifier and ClamAV as malicious, with high confidence. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect users to malicious websites.

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://ketchas.ru/uplcv?utm_term=siri+app+for+android+phone PDF link annotation
    • https://sintasyapi.com/img/userfiles/file/noboba.pdfIn PDF document text
    • https://triosms.com/userfiles/file/74353583800.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/kibijelukotisusagabipo.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/viwuferinudugesanudususi.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/wodezaxapadezagar.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/93958101553.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/fovamigiwuwa.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/semoxudofujonutenedok.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/84513643492.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/mupuxujiwabexil.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/nulesusunizazebunituwika.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/rurapavesevonubew.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/42445018826.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/sofabut.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/vabutozafinododi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/vezukinikima.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/nawesumava.pdfIn PDF document text
    • https://trexanh.net/upload/files/50044108511.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/gugugoda.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/fazusetiligub.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/wofige.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/defefi.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/vakemobuluvateragok.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_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 17720 bytes
SHA-256: 42cf2c303f6f75aa4f24531dca4afa8a0c48d845068cffd25c8fbdbf96d15f6c
font_01_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 10356 bytes
SHA-256: f118f469ac1e6ee912807a1bbd7483815ad81b3ffe06de883cc76096cfb46619
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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