Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff695b9c5d2ef476…

MALICIOUS

PDF

77.8 KB Created: 2021-02-26 02:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5df3f2a0996144e054b9e900d8826d5f SHA-1: a2c58278a3d45f60c92199f6949ee2cefddec783 SHA-256: ff695b9c5d2ef476b6f9973748d951fe6579d3bdb84b361fc23cf0bcc9a7d68f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or potentially malicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/wix?keyword=meses+del+a%25C3%25B1o In PDF document text
    • http://vetokikiw.22web.org/dulumunoronodokodep.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/mathematical_statistics_exercises_and_solutionsse16r.pdfIn PDF document text
    • http://dragonflysagewellness.com/vr_360_horror_cardboard8dahg.pdfIn PDF document text
    • http://copyrightnotices-form.com/warframe_neewa_choice6jpr0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5fff0f0ccf553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fd7db9a68e04.pdfIn PDF document text
    • http://good-production20.site/descargar_biblia_reina_valera_1909_espaol_gratisd14nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5fe778ccba963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fdd768d35088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_600b47abba2d4.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/3130391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lupebesu/cinebench_windows_10_64_bit.pdfIn PDF document text
    • http://vemesedesalo.rf.gd/how_to_create_circular_labels_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/cartoon_yourself_photoshop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/pikebikogula.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/open_agency_agreement_form_nsw.pdfIn PDF document text
    • http://nivugugop.rf.gd/timunoxonuvujinebodega.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/new_audit_report_format_2017_icai.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/mijejukepol.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 4940 bytes
SHA-256: 3545d57a9cc21ab826ad41836e1af4b8adb2fff87f126fe95e7d715c65d852cc
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11652 bytes
SHA-256: c274be66189c7041e08ddc00df6b9fb3e7dc1fc2220f227d296b1c09900ea75d

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