Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c01d49868c7013…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 20:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2e28cc3bb51847e47c87a56c58d8909 SHA-1: f61fa2d7988f33eed4db4c240dbaca31a35bb573 SHA-256: f0c01d49868c70138bec422a4d34b5e3acabd6e6a3e972bb7b8500604ab90d31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of phishing or malware distribution schemes. The presence of a link farm with a 'utm_term=download+j2me+loader' parameter suggests a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=download+j2me+loader PDF link annotation
    • http://vecsecity.info/editor_up/tadil.pdfIn PDF document text
    • https://laps.pl/userfiles/file/10119133349.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/68110892321.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wedirevotukizivij.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eacb64c7e7---buzoridixo.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/22704681352.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109140312238087.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/88758799687.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/73960613403.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/46385572739.pdfIn PDF document text
    • http://haki.vn/uploads/files/dasexiwuwopabo.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/pakafu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/44929922503.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/13340123971.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/nejuvazufinowabiruxinejo.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/58671670248.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/jitufatube.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/safekabapusel.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/mupedevu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff9b3cbc2---wakogasidi.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/vazeluvulixufurerexoku.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/73885101335.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_off0000bb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB75 16028 bytes
SHA-256: 63a0e1a880282cd3153de71ca069fa6d43a6d231b1afe597a0f3456e4f82f1b4
font_01_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10388 bytes
SHA-256: 4f94e81302ed8ac98302bfb0af59f84bb0fadc97f444ede462c1e39abbdf29d8

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