Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4a1299bfd2ec49…

MALICIOUS

PDF

75.8 KB Created: 2021-02-06 08:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31737c418a1339a255155b73c1c0b3f7 SHA-1: 713a68220480114b32708b1c89ee5fc654fb2eb1 SHA-256: 9a4a1299bfd2ec49f5bfec7582c32b6906f9562c1d5e060832c09d4d886ccee0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a mechanism for distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=project%20network%20diagram%20template%20word PDF link annotation
    • http://jegagavakunumog.iblogger.org/savebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366647/normal_5fef3ae1cd979.pdfIn PDF document text
    • https://guwasevotimonu.weebly.com/uploads/1/3/2/7/132741081/1b27c96510.pdfIn PDF document text
    • http://foxinawolukomat.iblogger.org/ec6602_antenna_and_wave_propagation_notes.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/702392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5fdf0112e9227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_601180e358db4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudegelufer.rf.gd/solajurotuzobozo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/50554828150.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/2x4_label_template_google_docs.pdfIn PDF document text
    • http://getojigukas.epizy.com/bbc_learning_english_podcast.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/40164178085.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/39509993897.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/editable_recipe_card_template_for_word.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/piano_music_sheets_with_notes.pdfIn PDF document text
    • http://rajemezipuz.rf.gd/fly_on_coldplay_sheet_music.pdfIn PDF document text
    • http://pidawuz.epizy.com/instagram_for_mac_air.pdfIn PDF document text
    • http://sakolowofusemog.epizy.com/12051732389.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/2178912447.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/robomizegemegovaxigebida.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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 5448 bytes
SHA-256: e696194f0efd0ed007f4eded2b69894da17f3f235f5ca82cf5cc1828bfb14e9b
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10812 bytes
SHA-256: e6f308a8a908c040f03e5a83aa64f4caba0a5ef9d58e6fe15e5016d4f42b5953

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