Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb491817e896896…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 22:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6cf7ac262bb31f3b76cba7edf1b91ddd SHA-1: fe0015b10f1f6210bb07a6b25fee9232abd8040c SHA-256: 4fb491817e896896ccb1b12f930037893b08f0c5d81cdb2408e63e4573f40a7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, indicating an attempt to redirect the user. The PDF structure and the presence of external URIs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://wastran.ru/uplcv?utm_term=copy+contacts+from+pc+to+android PDF link annotation
    • https://laps.pl/userfiles/file/tuvojiwulezekesaxozemeni.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/zoxozadolepemafesilubupiv.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25685023687.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/44781100130.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/dakiburulofiji.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/67212567372.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146c9b0010a9---serewizaxo.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/94181467306.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/82999571429.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/dewazedo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131491365e51---mubakunubifamasak.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/95409006366.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/ziwutokejalurapafubik.pdfIn PDF document text
    • https://membermimpi.com/contents/files/97971889813.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/deniwag.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210924050129.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/10074205560.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109112159361439.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/31914382449.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/duxapopa.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/zomegawofajanapapajupemil.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/burozedanarewafe.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zawalo.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/gunejubomabudirup.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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 10748 bytes
SHA-256: dcfee265168a5027f8fb464c55144aa1ca920fb3486e39f008890ab0dda43873
font_01_sfnt_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 16092 bytes
SHA-256: 89df638baeb0e520e5e454b0f363b4cdf9f6e6ccbefcb320a9bed8a45fbd41bd
font_02_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1