Malicious PDF — malware analysis report

Static analysis result for SHA-256 49786efec9f2a1b5…

MALICIOUS

PDF

79.3 KB Created: 2021-02-25 08:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 779cf980a3b36c9bdd61b6b9319bb68d SHA-1: d806a12165e61bcd095133f02beb7c1845320758 SHA-256: 49786efec9f2a1b54afe52f660ffd98805a7a1a3e318ce572059f859dc83e9f2
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 pointing to benign-looking files, but the primary URL and the heuristic 'PDF_SEO_LINK_FARM' indicate a malicious intent to create a link farm. The ML classifier and ClamAV detection strongly support this assessment, suggesting the document is a phishing or trojan delivery mechanism.

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://jacksth.ru/123?utm_term=origami+app+free+download+for+pc PDF link annotation
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/770912.pdfIn PDF document text
    • http://veloxezidirexob.iblogger.org/gefezofex.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/gjKtgja/super_hedge_birds.pdfIn PDF document text
    • http://rijuwutosepirol.iblogger.org/lil_bow_wow_songs_free.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/a22e30.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/SSgffnp/gawavezetamanavuzokapi.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/3ggImhi/movijizamebomudulidim.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/camallanus_worms_treatment_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/2idnhaV/ladorowa.pdfIn PDF document text
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/b0fb9bfd0f.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/9d8d38.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/juzewojavomofew/fitokuv.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/solving_equations_algebra_1_worksheet.pdfIn PDF document text
    • http://kagexukus.rf.gd/vegoxaritetisemomubutitu.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/super_mario_bros_3_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/google_chrome_browser_free_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/7917098557.pdfIn PDF document text
    • http://xefokezutuvij.epizy.com/pdf_to_dwg_converter_free_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/phenol_chloroform_extraction_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/smadav_antivirus_free_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/55330901312.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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 5416 bytes
SHA-256: 4b850bc88466d7d3a6521a1afd3fb7b4e951c29f38add1ab7eea3cfc552a3611
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10672 bytes
SHA-256: 8ac6bc4636b4bf50288f3bcf8133a0fbce885c812e34b77d3d81be2de8c53ac7

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