Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb58819b43712990…

MALICIOUS

PDF

78.7 KB Created: 2020-12-17 00:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 61282a1a26a82fed058f1aa933b34a13 SHA-1: b7947dc423e81b76dfccfa76a0aa66808b285f27 SHA-256: fb58819b4371299002e7e8d950655823fe50941818e56f46bfa98671a8f167f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to a link farm, suggesting a phishing or SEO poisoning tactic. The embedded URLs and the heuristic firings indicate an attempt to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://trafffe.ru/aws?utm_term=autodesk+alias+pdf PDF link annotation
    • https://xofokoraziv.weebly.com/uploads/1/3/4/7/134748977/5025424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5fd72e0b11047.pdfIn PDF document text
    • https://ludopugadataz.weebly.com/uploads/1/3/4/7/134709803/dalegex-giwawugef-texepolopefaken-mebojepujit.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/mumev_pefakod_lukokutofix.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/momumiletedatomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f87b1b08de1a.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/tabolorelirimuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/ipcc_report_2013_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/asvab_mechanical_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ce616609fd0ee7aa78df/t/5fcdb4ee978da30c561c0f91/1607316718933/friend_finder_facebook_chrome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf113ac0575613efdcb063/t/5fd72a5789566e781f689fd5/1607936600091/barrios_prelude_in_c_minor.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/bluetooth_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/wiwuruzixuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 4768 bytes
SHA-256: 88b794b7e66591d3523cb9ccf040648eeb82144c9176ac8534a6974ff9a1ba41
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 13916 bytes
SHA-256: a0d16a78a59ef0d07bd1b0abe232a6056f861fd3ce2b0669a0c66988ba9c3165
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa
font_03_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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