Malicious PDF — malware analysis report

Static analysis result for SHA-256 d388cc7a5d9324bf…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 13:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0c2b201a8103a531c6bf9981b97ce96 SHA-1: 31880b5499c04b1b24070ca2e09443ce5d01d0c6 SHA-256: d388cc7a5d9324bf8a5f5fd5b657357b38a8e451a76dbaa0def2b074056aa800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://padservhosting.com/userfiles/file/bipuvupaxerimosufa.pdf In PDF document text
    • https://www.alapan.org/fckimages/file/82884719578.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/gonowijuxosomezuzis.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/nugejetudizofebitesudiv.pdfIn PDF document text
    • http://szwygs.com/upload/zomuwizokomosodiwudab.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/51574856265.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb575fbb7---bidapiwirugaw.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/50940284312.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/xubagitew.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bemopubabopufox.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/78617718117.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/xoxemutawituxilazi.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/supexu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/70834983140.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/tulinefilupijipamamono.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/70012242218.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/52842185721.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/22657504639.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/73133247285.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210914_5EEE83E8B6BA00F1.pdfIn PDF document text
    • http://pedraferro.com/files/files/werepupegarivatetuvaze.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/8901691597.pdfIn PDF document text
    • https://signika.pl/Upload/file/refunubaxexorowikaxodemur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=generator+v+bucks+switchPDF 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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10804 bytes
SHA-256: 6620e29629a862c8dd2f6f3734687af2f65a1141817745b6ce1561fd63a1f402
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 18636 bytes
SHA-256: 7ef4464ef25c4ecbb5e108cb4738977a412da7bba352d277a7856ebc618e5286

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