Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fef9eea062fe658…

MALICIOUS

PDF

73.8 KB Created: 2021-02-03 07:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: baf0dfab5f8ff63434f2e94850d1a10c SHA-1: ed40ea2c1e8efa8905c817889b2a3d8e8a8f3ea1 SHA-256: 7fef9eea062fe6581b8031aa92b72e10aa3016862c5eb3298a840af1e8cdcc5a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

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://maypoin.ru/123?utm_term=describe+the+four+basic+goals+of+psychology PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366041/normal_6010fa8c22436.pdfIn PDF document text
    • http://fsfsfd.xyz/descargar_libro_el_12_planetalobkd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_600d1d1dee5d9.pdfIn PDF document text
    • http://setofexperience.site/bdo_courser_guideyj0c6.pdfIn PDF document text
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/xijezevebamab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_600e0b7d4182d.pdfIn PDF document text
    • http://centerbluebadge.com/xoludojukumobifzvsa1.pdfIn PDF document text
    • http://fevozogu.iblogger.org/examiner_report_edexcel.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/7075857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magajavopisili.epizy.com/sufixomiwuma.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/80536158814.pdfIn PDF document text
    • http://bogasupi.rf.gd/key_largo_marine_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/fm18_scouting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/xawovosi.pdfIn PDF document text
    • http://pegolika.rf.gd/top_20_punjabi_songs_2018_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/carl_linnaeus_biography.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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 5516 bytes
SHA-256: 816366e311ba2ebd0510cfad49e3737d763a1ab7fa2d8d05f67f14c6f8102bed
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10272 bytes
SHA-256: 1cdb335187224336cffd144d6b9824d43fc8717fffee5433d6e28a043d93681e

Open this report in the interactive analyzer, or submit your own file for analysis.