Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79193961de6faa4…

MALICIOUS

PDF

75.0 KB Created: 2021-02-26 10:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e4b8d3c8c8b8a34698580dba1a81ca5 SHA-1: 31c73c142d5bcd05a4d4246bc3966afc7c5abec0 SHA-256: e79193961de6faa427c013a4f9a098602372a14b71db953bd96dbb96c31aa0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a significant number of external links, suggesting an attempt to direct users to malicious websites, likely for SEO manipulation or to host further malicious content. The presence of a link farm heuristic further supports this, indicating a large number of outbound links designed to manipulate search engine rankings.

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
  • 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://druttle.ru/wb?keyword=best%20kept%20secret%20book PDF link annotation
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/7054553.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/fbbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fe6eb5f9cb45.pdfIn PDF document text
    • http://xsale.trade/fogidebuxekafarulo4xvo.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/2294148.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/setixafamikita.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/homophones_worksheets_for_grade_7o9pm4.pdfIn PDF document text
    • http://checkmyscore.info/vcredist_arm._exe_32_bit0v4is.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fd3d9434fdeb.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/zafijukopa/free_credit_report_transunion_equifax_experian.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/18763673902.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/nikuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/mopaxumen.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/44749517214.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/scientific_calculator_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/loraine_boettner_reformed_doctrine_of_predestination.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/48628287884.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/action_verb_worksheets_for_grade_2.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 4940 bytes
SHA-256: d6f5293731aaf9728a266cfbfdd7c3d81c5c8ae3fbb283c57bda6b66bb5a8468
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 10472 bytes
SHA-256: e797dcc0d878efe56717dbb21c68ca4d8c625a8388feb6062687eb8a6ce0b2a2

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