Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4ecf4cf1ca4091…

MALICIOUS

PDF

83.4 KB Created: 2021-02-28 18:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bf64875e8b757f330418766be5cd87b6 SHA-1: 6c6aebe84193a39dcdd930db362c98ab903f0e16 SHA-256: 5f4ecf4cf1ca40918f5800b1079aa8eb3ca65c162490a44eb1f442f09f0c789d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to drive traffic to potentially harmful sites. The embedded URL 'https://dugedepap.ru/wix?keyword=roof+repairs+melbourne+northern+suburbs' is presented as a search result, likely a lure. ClamAV and ML classifiers also identified this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://dugedepap.ru/wix?keyword=roof+repairs+melbourne+northern+suburbs PDF link annotation
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/sojulub.pdfIn PDF document text
    • http://kuliwajijet.22web.org/jasper_report_java_11.pdfIn PDF document text
    • http://jojuxidalizoxa.22web.org/how_did_friedrich_nietzsche_die.pdfIn PDF document text
    • http://tivepijezar.22web.org/21337150730.pdfIn PDF document text
    • http://nutesane.iblogger.org/contractions_worksheet_with_answers.pdfIn PDF document text
    • http://segwaywheelchair.ru/kukekofisezujuje74ubr.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/mozedijiz/free_wedding_invitation_template_for_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/23796630476.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/aladdin_arabian_nights_2019.pdfIn PDF document text
    • http://lujotuxubegu.rf.gd/16945891070.pdfIn PDF document text
    • http://wibenuke.epizy.com/2453162486.pdfIn PDF document text
    • http://zowujobosega.rf.gd/breville_espresso_machine_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/13187769260.pdfIn PDF document text
    • http://zikenonuto.epizy.com/pagaxesolubivuvizim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 5288 bytes
SHA-256: c500d5b572b14e78e2993712af940a18f6d8431ee4ec3713045f2e6ae68010f8
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10640 bytes
SHA-256: 425751bf88ece54998499a6ce619d80974e06f4aab064e598b11fb047e5899eb
font_02_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

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