Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d074d269331391b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 01:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 781b981851841c60d8e85388897fc65a SHA-1: 6259fb37dc4b6e0c3109ea84214203d5a08c9f9d SHA-256: 3d074d269331391b669ba208812742155db5fdf90128aeb8d6f04326890b6b1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=how+to+clear+default+apps+in+android PDF link annotation
    • https://civilkontroll.hu/uploads/file/nizitarix.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/kuxepizunimiw.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/sotofesivawegewevexobo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/53632313504.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/40490230796.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/sexedifowabevomi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/masaninefefeditenape.pdfIn PDF document text
    • http://lse.hu/userfiles/file/purijolalorililopudidepo.pdfIn PDF document text
    • http://shamayachts.com/upload/file/27102737808.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/xazivupiramujakipuzevafuf.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/67607120253.pdfIn PDF document text
    • https://theipbuzz.com/images/file/laxarujezimepaxitura.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/344609576.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/45107880149.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wirijinaguvupijal.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85639034811.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/moxali.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1bacc14281c99586514ff197e2fc4cf0/zelojijodemegigu.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/28015292834.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/wapotenexerer.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-11/20210911042606479731.pdfIn PDF document text
    • http://salkim.com/userfiles/file/natojuxukefunababojibot.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/votif.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163096901776.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/kuwejonoxemujalewanefax.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_off0000bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 16920 bytes
SHA-256: 65b8e8cb415de3271c541e975cb2345aa26017a27e0b209a24405c4367bea01a
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 10792 bytes
SHA-256: 0c22b94929c02580cd6d08b2e968af5e202b18e24560c36250681f9562f0e659
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1