Malicious PDF — malware analysis report

Static analysis result for SHA-256 904cdebd46ff26e6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 07:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e06f8eb2715b3c8519de048ba6831d7d SHA-1: 3e37b62f6044760e13eb883d7f9a5a7e698a48ca SHA-256: 904cdebd46ff26e676b9fd5149ea47e2623332a8434d02cfd4811c23785d19c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the embedded links points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sandsflooring.co.uk/ckfinder/userfiles/files/wuzojo.pdf In PDF document text
    • http://dienlanhtruongson.com/upload/files/doxamafirusipanukili.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/tosalegijurupumuxokun.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/puzomodevosozipovupetido.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/40796400340.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/54819169528.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_5746E67BB043C4A8.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/89285569511.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/53467021048.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/95048415462.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/75890768733.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wodoxotonox.pdfIn PDF document text
    • https://subded.org/userfiles/file/xemanobopofijaketafuxo.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/76260116961.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210909034950.pdfIn PDF document text
    • https://stormester.no/files/file/totarajolosidu.pdfIn PDF document text
    • https://theurbanthinktank.com/files/peken.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914112733.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b68296f0bf43d5e1e97b5559224d6a30/70528764353.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/difiwixudukav.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/86076984184.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/30657614580.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zoxazasimigufimoreva.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/57489462417.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ff4a5f7---72909381595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=picsart+2020+downloadPDF 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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 17660 bytes
SHA-256: fccd2218ab92ca84e1eb54ec8229b2ba9ef9514492d59b08a05788188299efe4
font_02_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 10560 bytes
SHA-256: 1488eeb51b0e67a21d0a8d04b30fe4d7bcea54aab9c96cfbdff0369d923b10c2