Malicious PDF — malware analysis report

Static analysis result for SHA-256 90718ba2ae235104…

MALICIOUS

PDF

80.1 KB Created: 2021-02-21 00:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e990d119623a9083dc81677c59f96b SHA-1: 70b3d8644d072457180378a3c40022118cd04cd2 SHA-256: 90718ba2ae2351042c1436863d6308a396dcd3607c3cb485b3d2e05cf69b8694
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 potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic and the ClamAV detection. The primary malicious URL identified is 'https://jacksth.ru/strik?utm_term=beethoven+piano+sonata+no+5+in+c+minor+op+10+no+1', which is likely used to distribute a second-stage payload. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=beethoven+piano+sonata+no+5+in+c+minor+op+10+no+1
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/d3903efb7d899.pdf
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/5107855.pdf
    • http://nonretloli.site/modern_biology_textbook_nigeria1zfhz.pdf
    • http://gsmall.space/discrete_and_combinatorial_mathematics_grimaldio1ujz.pdf
    • http://testrun.ru/transformers_beast_wars_season_1_characters3pkbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jemazejodep/35708247523.pdf
    • https://s3.amazonaws.com/megulu/popowatekexuwes.pdf
    • https://s3.amazonaws.com/xelimewat/ali_malli_mamai_song_mp4.pdf
    • http://fabodatutowew.epizy.com/togenodotalurewanamolivud.pdf
    • https://s3.amazonaws.com/salosibejodod/jazinidixobadeno.pdf
    • https://s3.amazonaws.com/vapite/c_checked_vs_unchecked_performance.pdf
    • https://s3.amazonaws.com/farokof/juwemuxatafuzapuvog.pdf
    • http://vovajixavago.epizy.com/34981566992.pdf
    • http://lawazujazigefon.epizy.com/equilid_50_bula.pdf
    • http://givemuzod.epizy.com/25142601655.pdf
    • https://s3.amazonaws.com/faduxodiwo/basic_bookkeeping_for_small_business_template.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/67029843501.pdf
    • https://s3.amazonaws.com/tugumeb/love_yourself_answer_traduction.pdf
    • https://s3.amazonaws.com/radubozufiwo/85318088057.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cd.bin
ad982079bb5485505ab5d5d05d404e0d3f35f0ea73fc20442ebc87e3715aeb34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 5568 bytes
font_01_sfnt_off0000f5a2.bin
032aae2d8e9d52d9ed68de17fd6cae5b8a4b597fad42d90a6036b561aa766d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 11308 bytes
font_02_sfnt_off00011b98.bin
73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 16120 bytes

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