Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a254868bc9df53…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60d68b9093f238c6f0a9265dd0da7942 SHA-1: 0a0d3e1823d2830d6ef41211b82fc4c0d838b3f2 SHA-256: 52a254868bc9df53e9c0be160e714fce1a46eeb4506a9f00cb51ee2323d79096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://synerhu.ru/uplcv?utm_term=reboot+apk+without+root PDF link annotation
    • http://stickerbarcode.com/file_media/file_image/file/fekewezujularidubuko.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/kevixabutug.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/bofulujiwijeta.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/nusorufuju.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/91011985460.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/9919998708.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/91984317928.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kekujufojudigumiban.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/jaruxapanopejibarov.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/13373518142.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zefowaxefisober.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/24946413330.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/41424641293.pdfIn PDF document text
    • https://kapefashion.com/files/files/30259200701.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/disudo.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/tuzibuwajazuxi.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/97718008504.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/43463830970.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614071f7cc899---55730864014.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/josinelimetogulawi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/rimelowati.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 18280 bytes
SHA-256: 85a08c42603b71b41e8c2c7cc1175255f0ebbe748aca7eab052e48cce7f13d6b
font_02_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 10492 bytes
SHA-256: 4de545965bb71a9e92f5c5aedf179518a0df1af5d5710a637db67915bb88d36f

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