Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b610c3e41779bd1…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 10:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c39be08a8fb8c0e6d4e47f6252ac6ae SHA-1: d83553ed2f012db538eadc49013288cdd0d6ca44 SHA-256: 0b610c3e41779bd1f8a9d220aee5396f5920318b29103e380e15122be5d2432e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's used to redirect users to potentially harmful sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infinijewelry.com/userfiles/file/39680039545.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/porufimapifotokuvelit.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/90685000319.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/64440816262.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/maregudasu.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/92499456633.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/mawuxatoxozel.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/12401766050.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/filunododazilufapovokul.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/lumeginewotolokusug.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/xetenawodun.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44265807043.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613630251e088---megefezatekil.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/pedudimikoja.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7cd1796e---52931844114.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/batutadidun.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nifuwafubumizak.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/2333369333.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/muxinanizugojajuse.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/legikuvoregumemulafakimul.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/43293186061.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/misawulojop.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/jibefepobabutinamoxetiwem.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/firilatalowakom.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/95494515306.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/17254579051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fs+14+hack+unlimited+moneyPDF 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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 10948 bytes
SHA-256: e7bb9ff88260a337e20589cad9a0ae60b34c4810cba972dd5c3f4377828c51c0
font_01_sfnt_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 15172 bytes
SHA-256: 88ddc6ddd27a191a5fecced5ee6a85c5af475babc0852973d1fb00b92cc4f803
font_02_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1