Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a1d5d936099f16…

MALICIOUS

PDF

83.9 KB Created: 2021-09-25 02:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 614093a6ab01f411313f5f78eab565ea SHA-1: 4fe63c89f55ce61bc45b3bc445008040080a6f3e SHA-256: a9a1d5d936099f16ac89b5b935dc273ad1d109b137aec32be68ee21e95e8fbe3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://unseretochter.ch/images/file/kisuxubujajamo.pdf In PDF document text
    • http://gesundezellen.de/neu/userfiles/file/jotevakuv.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f0bf32183812fa265fddb986bf60f3b9/29836865839.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/regatepusal.pdfIn PDF document text
    • http://inphilong.com/upload/files/57450256581.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/bidaru.pdfIn PDF document text
    • http://soc-in.com/data/media/files/boginefezewenekaloradoke.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/61890372533.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/papol.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/33132467622.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/solesugadivezupesevojud.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/74124335399.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mimiwafuw.pdfIn PDF document text
    • http://strap.sk/uploads/files/18941524000.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kobodob.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/19316141440.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/fadofunizanaxisavoduni.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/puluwazuru.pdfIn PDF document text
    • http://ipceurope.be/assets/file/dutunu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/jojikunuruzunudaxowap.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/2730983893.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee7078f2e---27389232084.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/15471135939.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///weteselaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=c%23+program+examples+with+output+and+explanation+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 23060 bytes
SHA-256: e93aa35e2897de275162a0f4e4f4d8b13fad5d58058343e69c47d2cb3e91f69d
font_02_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_03_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34