Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cbe91ae5551738…

MALICIOUS

PDF

79.7 KB Created: 2021-03-02 16:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f5093a612a3714ead87bc26a9886265 SHA-1: ae23b528943ba4cbf33cdad2c03cbb11b5ef08d2 SHA-256: 00cbe91ae55517387bb9479791647866dca82c019d4df851eac59beb09ed651d
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with a critical finding pointing to a known malicious redirector infrastructure at 'https://dafemum.ru/123?utm_term=best+warhammer+40+000+books'. The document body, though heavily obfuscated, contains text fragments that appear to be lures, suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest a spearphishing attachment attack pattern.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/123?utm_term=best+warhammer+40+000+books In PDF document text
    • http://myfirstsite.xyz/19750377362umfyh.pdfIn PDF document text
    • https://minebetedobipas.weebly.com/uploads/1/3/2/6/132696067/1123330.pdfIn PDF document text
    • http://fesabip.iblogger.org/elektron_analog_heat_mkii_manual.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/vukajevowedubo.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/fizugiwiwit.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/the_electoral_college_is_constitution_charged_with_the_following_duty.pdfIn PDF document text
    • http://bathforlegs.xyz/18251034224ofxwp.pdfIn PDF document text
    • http://tovelksa.website/after_effect_cs6_portableyi2z9.pdfIn PDF document text
    • http://zedateve.mypressonline.com/597031772.pdfIn PDF document text
    • http://reetodo.online/2411795240624t1l.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/7aed9.pdfIn PDF document text
    • http://sevotapapi.22web.org/educational_psychology_doctorate_entry_requirements.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rinonefor.rf.gd/95889814305.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/ethnic_conflict_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/data_analysis_and_reporting_analyst.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/fupudojorekuwok.pdfIn PDF document text
    • http://pexirofovuj.rf.gd/fl_studio_free_me_download_kaise_kare.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_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 5468 bytes
SHA-256: 113c453763706a4dd3806646216eace74d1f84c2ec98a88ff618bdc32ed62eaa
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 13380 bytes
SHA-256: b9bf69354f9ab302d897105b42e2f539eb8a20abd4f4eb655ad8501191fec3d6

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