Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc89e6ebdce5f1d…

MALICIOUS

PDF

66.8 KB Created: 2021-09-27 17:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3e4e020d8f9fc2354fb9e78e0c5b6dac SHA-1: f3eb850185b69d03ed1ab49c1b24748c62d90b58 SHA-256: afc89e6ebdce5f1d0432bdda280072dae3b78d5ea7d814e91d3ada2124282e3a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to obscure the final destination or distribute a payload. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.2167

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=kingroot+apk+free+download PDF link annotation
    • https://sindhuinvestment.com/ckfinder/userfiles/files/pibonomadizidafopali.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/45458600446.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/gulafowisexaluzokijamifef.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lizeru.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/winameguvomatediso.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/tikadix.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/lawumevopenujuzuxixara.pdfIn PDF document text
    • https://basisangka.com/contents/files/nubobadutuxedubixoro.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/2904792862.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44594100341.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/ruxufovivepibovuruni.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigun.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///37078012077.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/fowunixosuwuwoza.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/54147761651.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/wozogumifogabedikirizusep.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161509751270c6---wadotubolametawesarujoger.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/xugowujojagu.pdfIn PDF document text
    • https://adikketiga.com/contents/files/99431679039.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/97536163365.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/tifefo.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/kurikituzisodibizofut.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/76063746386.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210925184740.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/78378447055.pdfIn PDF document text
    • http://immopolignano.lu/images/noduku.pdfIn 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_off0000b140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB140 10672 bytes
SHA-256: b3b6ac3bab5d5796c46b1af34e1b398d9863361fb8bf668cd1fccc17fd5262c4
font_01_sfnt_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 15412 bytes
SHA-256: f4fa71d2b555cd92e19406b9cb69ae72b58a3f3b0e12eb61f3201b4f0ce2f23e

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