Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e288d2a81aee6b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 14:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04a5505122d90510e748ec4dbfa768cb SHA-1: 7b48dcb266365e60d6aafcc8863d41a5b73f3928 SHA-256: b1e288d2a81aee6b5b4b7c5d2a7e8e6064aaa16e7df9b9f06951778c31cf5b9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier returned a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to potentially disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a larger pattern of link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5408e547222021d40d2421c9d5b529a7/76046260601.pdf In PDF document text
    • http://kavernoklub.com/campannas/file/ribovuvovonerileruri.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/gafifikoxen.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334ed78bde2---60760843815.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/65713637399.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908091855.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/xeniwapifuvefam.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/89456424031.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nexugixupibovinofesi.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bikaronevozijowejekomini.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/tapajekupos.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/73657009227.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/baralifikadevikepamoxa.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902035814.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/89929894990.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/84345721232.pdfIn PDF document text
    • http://tiquital.com/documentos/file/vudebasa.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/75689418578.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tifivalefazepavexi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/fekaw.pdfIn PDF document text
    • http://deltools.com/userfiles/file/40238831544.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/61582242452.pdfIn PDF document text
    • http://uco-kampen.com/media/files/tagorejume.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/8135801235.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/ralinuteximiwig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=spider+man+ultimate+powerPDF 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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 17860 bytes
SHA-256: 7b168306b71c99a051b3b54ae03f7bef57016dd72c2fda88898c1761b88300d8
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10648 bytes
SHA-256: 65a61bc7490a96ef195fc9b9e5c75baedc2082bc44ad0845343b23f6b7262d9a