Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9a181d479dac72…

MALICIOUS

PDF

70.2 KB Created: 2021-01-25 05:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 88ee033002ddda3f21ff1abaf7e7189f SHA-1: 79695d57a38b020f941e0a94b697f17e073a7e9f SHA-256: 5b9a181d479dac72564662d2203e30c366612de1ce0371839f479a7a0094b417
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The document body, though heavily obfuscated, appears to be related to academic material, suggesting a lure to trick users into visiting these malicious sites. The presence of multiple redirector links and the ML classifier's high confidence score indicate a strong likelihood of malicious intent, likely for 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=costanzo+physiology+5th+edition+pdf In PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/9971887.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/94061536209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5febf310aa669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5fd63ea3e8bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fce33db96e41.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/f7FEOW5/48306860611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulefuzobov.rf.gd/best_islamic_quotes_from_quran.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/introduction_naval_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/aneurisma_de_aorta_toracoabdominal.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/gapitetawizatozizevabeg.pdfIn PDF document text
    • http://rekipefivikupa.rf.gd/83877726613.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/simple_resume_templates_for_freshers.pdfIn PDF document text
    • http://zepibugab.rf.gd/88029320618.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/juzug.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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 5388 bytes
SHA-256: 13a789794d746503c788316f446063301957f75e56fbe111e8911205c664f75a
font_01_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 10812 bytes
SHA-256: febe9868bf8e80ba8d81726f04a89dd09f2940a98d9a525924ccaa4261781c16

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