Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aeeb9e59b5dd4d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 02:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fea219ed4f28c56bbae7ba9c8c1d8d0e SHA-1: 67b6d16af9d7a7f8ba4a3a9813fb05ce9a79c4ae SHA-256: 25aeeb9e59b5dd4d9c7158f315e5786323a6949a77678843b52e669c0b74fc18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=real+ludo+adda+apk+download PDF link annotation
    • https://byocamacho.com/ckfinder/userfiles/files/vexixojumasitejijudelif.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/78716122996.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/sofoguk.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/loforexo.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/29819389146.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/danoro.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/17063775010.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/fewulokizutexavolad.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/mosebunuvixunenefez.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/tolirumezibojisiwogigusu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/40351591798.pdfIn PDF document text
    • https://bnovum.hu/downloads/daxugafojejikada.pdfIn PDF document text
    • http://kachelofen-prommegger.at/fotubevupiloparanudedowal.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/zesowonemelewi.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/19531738324.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/55976977801.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/51019476503.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/37149620746.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909095148_92laxv.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xiwuforepozup.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-7/20210907090427835075.pdfIn PDF document text
    • http://safarang.com/basefile/files/sugoxivarozemali.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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10248 bytes
SHA-256: 585aefad9d2e9e877fbd95e62dddc8b2688d328f92cc48b6f6522589a1bfaa99
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 19212 bytes
SHA-256: 88b9ef9adba5ac3022eb643047817ea23afee2b6f68b14e45d72fb98a71e29e2

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