Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcf2651b29b699…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 17:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 421e487a718c577a37f4d739ca279fcd SHA-1: bb56a320d06949c19e3dce62cb6f5f7d9605736f SHA-256: 91dcf2651b29b6997f7c417372839525caff8dbf291635a29db5b3d1e1e5915e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a likely attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious actions via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=10+tai+chi+moves+for+beginners PDF link annotation
    • https://medgal.pl/admin/ckfinder/userfiles/files/76578141437.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151c5dbc78d4---23445678115.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/91781612810.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/49039682342.pdfIn PDF document text
    • https://labelmarket.eu/data/file/pixofexeganimekametofup.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/gesozowu.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/73726353558.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/96150535801.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/maruzewedawor.pdfIn PDF document text
    • http://capri.lt/userfiles/files/gazobikawutuze.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210924_68D3714B988EF8E4.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/24978631422.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/5370052150.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/zowazizemob.pdfIn PDF document text
    • https://adikkedua.com/contents/files/xubijadogezo.pdfIn PDF document text
    • https://successalpha.team/upload/files/50681571341.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/buzefexewapane.pdfIn PDF document text
    • http://indianamartialartsfitness.com/flash/indianamartialartsfitness.com/file/kipun.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/88670055232.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/jigamavuderat.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/fagudomi.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/sozuwuletivir.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vizubixetew.pdfIn PDF document text
    • http://khocabien.com/uploads/files/gelakemupixifidakox.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/34512430754.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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 17804 bytes
SHA-256: 048579b582c71f55dc2e4c4e0cc9e7b3339271e1c17225950ee0b8945c4fee1f
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 11020 bytes
SHA-256: 2f57f81e370829594e4971a02de2248e99e1105fca3404b502dd5527ccf51c64

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