Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8eac5386cac3c5…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 01:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad7f2ae9ead166b7bd4c8d5d988153ce SHA-1: 9760494f218794f868122ac0666f0c16a2f8c2a7 SHA-256: 7e8eac5386cac3c5c4fe18d08bff4a492f127a094f62e8d82e051f92f855f11b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.ks-klinika.ru/ckfinder/userfiles/files/38141352463.pdf In PDF document text
    • http://khiensa.com/UserFiles/File/bisebajovefune.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/kigowoguxeremegudafuv.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109100551117038.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/rojogajoxuliseb.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328508ed88d---35019431392.pdfIn PDF document text
    • https://majubesar.info/contents/files/20179246792.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/dovinaxijasezuxiromo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6cad88c9---13285522139.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/nijosumarivijalu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/88274175487.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/14787780305.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/46924636492.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/viwalebuginikaramaramexa.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/45282175104.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/vidatuxo.pdfIn PDF document text
    • https://tele-video.ru/upload/files/wirefupupunonotizupezef.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/91945062900.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mapuxatozase.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/20078222012.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/wazonugobe.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/97403921885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=now+you+see+me+1+watch+online+freePDF 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_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 10932 bytes
SHA-256: ea660ebedb20c907ca2a1bdc1cc03e5387b0fe0b1f2cde570cb55182ce5aec72
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 19668 bytes
SHA-256: f6d85511bb9c24a439d6e0477bf6a1a90d46c9575add40247a008d8a9610337b
font_02_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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