Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09ed3b9e0cbfe91…

MALICIOUS

PDF

78.3 KB Created: 2021-03-08 12:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9b59bf2f643edb9155e1479d944427a2 SHA-1: e95dc11d07fdb915c5379a6af938543fd0889dee SHA-256: a09ed3b9e0cbfe91355ed25c5234e461bce08f36ac54ae00238e6d509ec1e864
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'https://xajibur.ru/wix?keyword=stainless+steel+manual+tomato+slicer', which is likely a phishing or malware distribution site. The PDF also functions as a link farm on disposable hosting, further suggesting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=stainless+steel+manual+tomato+slicer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471082/normal_60113756bddff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_602bfffc1e646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_cf0d95a20e854a0dae876758094edb3a.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_ce901e717c0a4a4984f02ed54b6a915d.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_85a3495bdab84e208392b38f74e2f06c.pdf?index=trueIn PDF document text
    • http://xekaboz.rf.gd/beats_studio_3_wired_headphones.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_5d866175a94543f9a5a505ea57eaa924.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_700a7106335b4ffea6fce61608abdefd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/crystal_reports_2013_edit_sql_query.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_7168573b95684142bbadf2bb4d6c0148.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/13493239289.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_987ce58c964846ffa669ce92545a01e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/report_loud_music_at_night.pdfIn PDF document text
    • http://lijaros.rf.gd/fender_mustang_25_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/56503931838.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/80393635486.pdfIn PDF document text
    • http://mikesivu.rf.gd/whatsapp_video_call_free.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_350463f375d74fe8bfec5de74fa3d287.pdf?index=trueIn 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_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 5048 bytes
SHA-256: c7bf36fcd97f3b75633ab87f86d4a7e255fef4cd538e9d31e675429a18cfd06f
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10396 bytes
SHA-256: cacddb51250abc9935b4839bdeefc75429c1b5b9873019aa39d21ad9e6bea99d

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