Malicious PDF — malware analysis report

Static analysis result for SHA-256 f811ae586020056b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 19:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06dff13b24c023c83466b0a8ffd5e000 SHA-1: 2300795ade0404345aee538ded7851561bf12214 SHA-256: f811ae586020056b0af96bf7111b79e73502061678712ef06979e06380e2144c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external URLs, with several heuristics flagging it as a link farm on disposable hosting and a random URL. ClamAV detection and ML classification confirm its malicious nature. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://federicozucchettiarchitetto.eu/userfiles/files/tibojeraxawasiwokebalimur.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/goxekisu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130677612454---xobuxatok.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/wolin.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/didoxanivim.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/wulijenof.pdfIn PDF document text
    • http://orderkai.com/uploads/files/luvumiwagunuwelod.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/39478617521.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/43007479511.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/zepamivudevugeresiwij.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/49973801517.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912130213.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/diwoninodagazozunosozi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/dukarelojesezofizenu.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/norowaxovipajirokefix.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c140ef6---bumaziralafezunakum.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/20395950139.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/22159197407.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/gosetenatodizazeruleri.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fozinogerinogikatigujikuz.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/sifowosopixipe.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/80604380049.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/goledumexadepuresajolopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=transfer+calendar+from+android+to+androidPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 17672 bytes
SHA-256: 5682eeea784b34a14c58f45a0bc29a5baa71ff589a6a6ba43a91bc915e3b3623
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10600 bytes
SHA-256: b0d2f45c73254a355ba74f04da373dbb45c6d7e2f7a24d6104df035ae1bcac4d
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1