Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d7fdcc45d407bb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 03:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0057cbfbfe5e980f6aa493290c4575c7 SHA-1: ceb190741a95211facbbfec5b23e7b02364369df SHA-256: f4d7fdcc45d407bba085eff365c6cc789f037b813f0152d082176d37d2cb4460
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the PDF structure suggest it is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=rap+rap+apk PDF link annotation
    • http://ibnuaffan.com/ckfinder/userfiles/files/79997895380.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/69036362670.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/22018989630.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30200515982.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v682pssls02h49v6rg72a31r9g/55818629423.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/74018462832.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/745pkibtiupv2s13o7ja69cpok/wiwigaforo.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/lalop.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/kelir.pdfIn PDF document text
    • http://faradbox.pl/files/file/52939706229.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/20569703070.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/tenititegumiven.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/82759676417.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/23258185092.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/timapoxijawakuloziwisab.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/96005122599.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6892021284.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/88345378574.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/verelimaruwo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/38840067688.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/12411221509.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/dabodawutiravusamixixoma.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/13921212883.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/123361309.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_off0000b404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 14764 bytes
SHA-256: d14e3e0a4629a7684d4ae583422f1d357a877dffea6ee8761ac6496ad7d50896
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 9620 bytes
SHA-256: d74a11c66bf859ddf0c4f91ac553b94b19ae9817a76f5c088e2794ecf4ac089f