Malicious PDF — malware analysis report

Static analysis result for SHA-256 d385161d2cb56cb7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 07:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9e5dcd23e5f2eb1898db5841a6c81e8 SHA-1: ecb3abab240dad44dc81c4e0a75047c8915f0eed SHA-256: d385161d2cb56cb7fef9b757eb319c4d8c3a034ce511e552fdd6eeeeda582175
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the potential for embedded malicious content or redirects designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sbmhavacilik.com/userfiles/file/setivabilodapesotabim.pdf In PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/2995914306.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/64335786477.pdfIn PDF document text
    • http://shahgrp.com/uploads/20510909106.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/89030238171.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/46562936514.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/57889397963.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/bidetitos.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/tazef.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/lojinogopujagewo.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/sovilotixadadirevutadir.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/90481067224.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/2274470647.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/rexixar.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/71452901513.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/guguxebot.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dekoverikumozage.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e323504a---xewanen.pdfIn PDF document text
    • https://istanajp2.com/contents/files/41083916468.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_085F5D29331FE542.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/mapedipovabimimezuxapeba.pdfIn PDF document text
    • https://citronel.com/userfiles/files/numasagofoletu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/79879754671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+device+manager+applicationPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 18252 bytes
SHA-256: 6a5dea318b70244df2046268c3c6ab5256fd1ca65512f6be834b914386ee3ed3
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10736 bytes
SHA-256: 79ad407ffefad5930a433bc373f8fd8f4d2d555d5a31e162ef89f23d415197e0
font_02_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1