Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f0880551fe12c3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 11:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63313e09de9ade22b039dac742468658 SHA-1: 82086f31b44902ee5d7242de66f35e6e0f175f98 SHA-256: a0f0880551fe12c3a2989e672490713d884a1298b7ac85143bc2f4661eb9d4ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one pointing to a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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://crysiq.ru/uplcv?utm_term=clone+app+run+multiple+accounts+mod+apk PDF link annotation
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/lowarabusibunebore.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f606934fd6---57583620176.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd8f02fe6---wumajozunubowiwizoteji.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/43063656419.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/55782599790.pdfIn PDF document text
    • http://hkwwta.org/userfiles/rululefowafabupegabimonu.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/71238598747.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/76942440114.pdfIn PDF document text
    • http://nscenter.cn/upload/files/fozazikuwufepopekiz.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/torar.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/79787661132.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/31245083145.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lawakumunodovirowasur.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210911_095911.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197656484937.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/91602591135.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/giritasemorib.pdfIn PDF document text
    • http://htwy.com/upload/file/44548567755.pdfIn PDF document text
    • http://maksimetall.ru/files/kufekuwugimuvo.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/pimoxek.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/kugabowafafaden.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/rerumisitasera.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://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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 17924 bytes
SHA-256: 4d9bdc616cb8cfcfea61bda27f367bf4e07fc3ddfc3030075cb899300d888177
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 10900 bytes
SHA-256: e91a93f75d9bba9bea7c779c6d7cfc231a9706745cb58e451078e7c7d5a5693a

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