Malicious PDF — malware analysis report

Static analysis result for SHA-256 96998f57a887d5ce…

MALICIOUS

PDF

94.9 KB Created: 2021-02-03 10:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bd2d56440b4beab413d17dd4a6b69164 SHA-1: 64823eb3156dc067d2d344eaaedd9715aa6680dc SHA-256: 96998f57a887d5ce9007665c4aef24dae21671b4eecf25722a0393723d3d2d87
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically 'Pdf.Phishing.Trojan'. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

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://jottigo.ru/123?utm_term=chet+atkins+guitar+style PDF link annotation
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/89d33c7c.pdfIn PDF document text
    • http://mritzoliver.design/13641509498epfbc.pdfIn PDF document text
    • http://english-10.site/15431926184zfekq.pdfIn PDF document text
    • https://padokerasuwo.weebly.com/uploads/1/3/5/3/135319223/bfce0c.pdfIn PDF document text
    • http://shoop-ff.ru/cannot_open_file_d3dx9.lib220qs.pdfIn PDF document text
    • http://kusadelopo.iblogger.org/dance_concert_program_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ff1432b0f57d.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/tikofaketonub/erron_black_outlaw_combo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/jemisuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/7628714773.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/descriptive_statistics_in_sas_enterprise_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/aradhana_new_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/wefegarejino.pdfIn PDF document text
    • http://kejusekijo.epizy.com/lawudidemeketum.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/fegaritazidaxusogux.pdfIn PDF document text
    • http://pabisuf.epizy.com/chemistry_haloalkanes_and_haloarenes_ncert_solutions.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_off000137ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 5016 bytes
SHA-256: 0783a1f2d3a2623bb5b4c06260eea86e53c323584873be8ae4d4b11e31d64fb5
font_01_sfnt_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 11176 bytes
SHA-256: 24f4ab99b0f109306cdd651db437d9c1343c457fa50b5bd05c22c146c5b10771

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