Malicious PDF — malware analysis report

Static analysis result for SHA-256 e573eea62e284f31…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 20:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a06c9c81f9dba56b4347bddc9cfae638 SHA-1: f250c799b68472ac532f0121a973b65d728e5b5e SHA-256: e573eea62e284f319b293b2ad7959a409d2bb7303e5b142e97d8ae407b3ae83c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links on disposable hosting, reinforcing the phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tw-itemaos.com/ckfinder/userfiles/files/69251059829.pdf In PDF document text
    • http://adams-gold.ru/archive/image/file/63126383257.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/12469879985.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/fatesasabegeburadofebeke.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/mifubijap.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xotasonuxofixepefexowu.pdfIn PDF document text
    • https://anfauglir.com/images/file/15303195052.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/vasolarop.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e008f7a10e---50908017396.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jagekebuvuxakuxarivele.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/juranufawodulelesopu.pdfIn PDF document text
    • https://csodamalom.hu/files/files/jogiletoziweliduworabegij.pdfIn PDF document text
    • http://toonesk.com/upload/59596242096.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/mijasijitikiros.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kijodafiwejeluvujutiziv.pdfIn PDF document text
    • http://foxadv.net/file/nolodifabalo.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/27453081295.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/saxoleketetasa.pdfIn PDF document text
    • http://teknis.it/userfiles/files/53648145288.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fbb765eea---61297914451.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamevovawopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=clash+of+clans+mod+public+serverPDF 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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 16168 bytes
SHA-256: 3fb80c43f4cd183ffd3e734247526345a2e04a1d597ec9121a0f076eab97b599
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 11124 bytes
SHA-256: 8a2b20f103947952c415fe4ad139b3d50cada00eac30d958d54d9dec9b28662f
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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