Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5def4817f83584…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 924abeec852b3274e10798fb81948e6e SHA-1: 8bdba8f4e90d06784a759752a1f7406a4460a32a SHA-256: 1f5def4817f835844a5250b97fc62457022cebe11b58bbe9f5403bb0046e9db6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm structure are indicative of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=street+fighter+iv+download+android PDF link annotation
    • http://chikatere.com/Upload/files/40511348284.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/78752477635.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/fusagekolalodumifi.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/xumebikinuwudu.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/dupejeputuwudibofewaka.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/tedepumejexawafisilot.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/degududixejizadusi.pdfIn PDF document text
    • https://claudiodituri.it/uploads/xosagotivozuverozipisiviw.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/bajomogasajaxajalimud.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pifixutavu.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/21954468609.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/90341814419.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/12339237148.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/25393112853.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/gopib.pdfIn PDF document text
    • https://thietbigas.net/media/files/fetinagudugow.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/93797622925.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/xerotorarevozutiva.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/vofijazetodegedovesejugox.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/teserar.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109090534225062.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/zevegekemus.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/golalesokebuwekeva.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/wizidet.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/932590053.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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 19340 bytes
SHA-256: f27132287c07b6a9bb49a224fe7e0efa19f21bf1bddcdf824c0ab599bf363e3d
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10692 bytes
SHA-256: b7d5fa153a28e47b7feb13ed968726b2b7cfc58bf86cf6479cd60b6dcb29a173
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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