Malicious PDF — malware analysis report

Static analysis result for SHA-256 f423837f6865068b…

MALICIOUS

PDF

71.5 KB Created: 2021-03-20 18:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5de80a481cf85ce4d76e6ee85eeb8f09 SHA-1: 2193567afdb6d464992bc757ccaeb95ff601fff2 SHA-256: f423837f6865068babc0c0671bdf5597ee9bb639e24d3c61cca27a2aec640bb8
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 PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://jacksth.ru/strik?utm_term=norton+anthology+of+american+literature+8th+edition+online', appears to be a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=norton+anthology+of+american+literature+8th+edition+online
    • https://vesetiwavulajed.weebly.com/uploads/1/3/1/3/131381055/vopevaro.pdf
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/f1eb27dc.pdf
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/3dfc2.pdf
    • https://bidijewufamidu.weebly.com/uploads/1/3/5/3/135325384/6249454.pdf
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5fec4c8d436e1.pdf
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff9fce2a88f2.pdf
    • http://rivoduzajoki.iblogger.org/dimewot.pdf
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/6724595.pdf
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60446a7ecce18.pdf
    • http://sodiwemewobigi.22web.org/punazovuzawu.pdf
    • https://cdn-cms.f-static.net/uploads/4454965/normal_6051c8ecf0463.pdf
    • https://cdn-cms.f-static.net/uploads/4416653/normal_603fadda9f2c4.pdf
    • http://tenopokas.22web.org/diamond_as_big_as_the_ritz_characters.pdf
    • https://cdn-cms.f-static.net/uploads/4451035/normal_5fdc69b16b820.pdf
    • https://cdn-cms.f-static.net/uploads/4476301/normal_60291c9c9465f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/votawawo/78999359431.pdf
    • https://s3.amazonaws.com/palikuvexake/iadt_trauma_guidelines_2017.pdf
    • https://s3.amazonaws.com/budovewesekaz/yamaha_r6_workshop_manual_free_download.pdf
    • https://s3.amazonaws.com/kakef/1217868970.pdf
    • https://s3.amazonaws.com/tipikaxe/irs_appraisal_summary_form.pdf
    • https://s3.amazonaws.com/zafirawit/18237458913.pdf
    • http://nosijatigatu.epizy.com/digital_score_sheet_basketball.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76a.bin
50b0284c9e24307d7ae183fe6379a00b37047be03a4c087c2e035d6c76e3b1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 5520 bytes
font_01_sfnt_off0000ea19.bin
7a2f10d2870f82fe8e09217341f6a05fe2f8e188b1d77e1341ab5432c8c86d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10496 bytes

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