Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06960f3deb0e2e0…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e65ce1513f74f2e3f67df09eaed759f6 SHA-1: 0443e6a33f03fe4a2170e95175345e8ae776dea2 SHA-256: e06960f3deb0e2e0e07a56ff5dcc2350045a7564c886dbd5f917c380f7133624
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are used in a link farm configuration, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=b612+online+photo+editor PDF link annotation
    • https://lideregitimpaketleri.com/calisma2/files/uploads/75388497821.pdfIn PDF document text
    • http://tlznailspa.com/media/files/faxib.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210920125141.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/58337093377.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/22418848419.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/kadanutazebenukigubuw.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/sonedibixibajuxerogimizi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/65329206663.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/84151335982.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614219bf586b3---19496887709.pdfIn PDF document text
    • http://consade.com/userfiles/file/padesugoxi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/12345460271.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/jenivogepekodaj.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/pewuvafelokikapibo.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mumumugokuvite.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/vegabogatoxivefi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614748c0b0c15---sudukomotab.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/mifonidowi.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vatutogabomor.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xiponugusidejod.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/fuxojenetonimalebu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/83494859630.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pixumetina.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/sufiboderadojituwu.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_off0000c1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 10552 bytes
SHA-256: fe9fe459b3f00b05f00f511bb374e93ebf56ead1b23ee5f6e044b0c99070e638
font_02_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16224 bytes
SHA-256: df4959290c523f58274da6b6ec6ce38a139015db1df663ef952cdeb9e7d9f858

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