Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b9c5842e04038d…

MALICIOUS

PDF

67.5 KB Created: 2021-02-22 21:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 51f7ebcf8c737925dbea42cbf4580030 SHA-1: 29a3e9f17e56a4d0a449e49855f85ec5324a170e SHA-256: c2b9c5842e04038d6684bb8cbce5c2d2d10dd1b20b1cd746548a201eda0f5ef0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, potentially leveraging JavaScript for execution.

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=descargar+libro+de+josh+mcdowell+evidencia+que+exige+un+veredicto PDF link annotation
    • https://kofiserifopame.weebly.com/uploads/1/3/2/7/132741397/sowumuloxeseko_lodapuma_vufikevob.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/54023.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/6863425.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/868662946.pdfIn PDF document text
    • https://tosafesixagosug.weebly.com/uploads/1/3/1/3/131383933/2529157.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/eda68c4d1b.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/savukojubusum/70016495090.pdfIn PDF document text
    • http://mizebonemis.rf.gd/top_10_landforms_in_south_america.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/fortnite_save_the_world_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/android_tv_box_file_explorer.pdfIn PDF document text
    • http://pukafenofi.epizy.com/mexolomupoxoxejaru.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/fybsc_microbiology_notes.pdfIn PDF document text
    • http://wurunuj.epizy.com/weather_report_standerton_mpumalanga.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/11656150175.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/67299063387.pdfIn PDF document text
    • http://lipesomidu.epizy.com/aaru_songs_ringtone_free.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_off0000c354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC354 5912 bytes
SHA-256: 9c7d5667d880427a390faddecdec316b9182c9fc7cb9f97ca5adb54aeaf4f190
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 11928 bytes
SHA-256: 90e3390d2656dfe33028da025aad99a09b86d8b7cf78e920fdf9f88f5de83718

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