Malicious PDF — malware analysis report

Static analysis result for SHA-256 517ff12951115403…

MALICIOUS

PDF

71.2 KB Created: 2021-02-12 12:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa69bf857eec762e32f6a053e302a081 SHA-1: 0aaf5e298ea1fb05ea90c34cf8950f247acd1569 SHA-256: 517ff129511154035df0ef1f7cd28d5767dbedcb435494211240b107b7809c2b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm designed to distribute other PDFs. One of the primary URLs points to a site that appears to be a lure for a college application template. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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/wb?keyword=sample%20college%20application%20letter%20template PDF link annotation
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/a3075c455f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ff213c8e9df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fc5ed56ee5bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_6024732ac8ca3.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/fudifefux-nofuwolewawedel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_601fe00a80d8a.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/eb3fb235f3.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/tinivukedeta/daworilonidugob.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/basara_temple_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/sharechat_app_apkmirror.pdfIn PDF document text
    • http://turojupa.epizy.com/1205039128.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/chaahat_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/zedotobijavibisugate.pdfIn PDF document text
    • http://ketanuviz.epizy.com/81958981365.pdfIn PDF document text
    • http://xebowuruno.epizy.com/bed_sheets_sizes_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/ramadan_2018_time_table_delhi_in.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/48517601446.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/wuwagafowamimoxofovoboxap.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 5176 bytes
SHA-256: f3a630dca514284af47661d70266e490b32eda4e60dda5fbe4a35d63ca60f06a
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10008 bytes
SHA-256: 5f06686650195212d6a44a57fbe1fac9b067d50b45e7822fb266af10bb35aaaf

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