Malicious PDF — malware analysis report

Static analysis result for SHA-256 f921dc2b06ba626d…

MALICIOUS

PDF

67.0 KB Created: 2021-02-19 17:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 90247364b3f9652215e316ab294fd952 SHA-1: 2c201bc9528459b455f563cb53f335c8031d11d1 SHA-256: f921dc2b06ba626d07ae6db4436091724963ea1f896896782b4e7c9251c7fa6d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Giancoli physics answers'.

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://bologen.ru/wix?keyword=giancoli+physics+answers PDF link annotation
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/jidosafe_podelixipabif_vukike_dugemivexowu.pdfIn PDF document text
    • http://razvivatel.blog/8622662560694s0n.pdfIn PDF document text
    • http://peludofnor.fun/hp_officejet_8600_plus_printer_setupmi2nv.pdfIn PDF document text
    • http://verification-help.business/bootstrap_store_template_free6cu2r.pdfIn PDF document text
    • https://dawejufajipamoz.weebly.com/uploads/1/3/5/3/135350304/6175067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_60258ac30f811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magoravir.epizy.com/84635001996.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/lelonuwedatatila.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/89432315569.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/firezimetodinixevoxiwoze.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/baxirir.pdfIn PDF document text
    • http://gadudadu.rf.gd/itil_incident_management_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/71586322176.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/mainsail_tuning_guide.pdfIn PDF document text
    • http://lewozato.epizy.com/what_is_the_process_of_curriculum_development.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/ajooba_movie_video_song_free.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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 5244 bytes
SHA-256: 03ec93d0c81ebe653f9f64c96afffd3b76cbdd118d0d5adc87f570f932fbe924
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 10888 bytes
SHA-256: 8d3ff6dec176cb899c0ca9418e9a0596eabb6bda379af31b388319479b3f5af5

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