Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4148f00908c117…

MALICIOUS

PDF

80.6 KB Created: 2021-02-27 04:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 248428f99383102a14acb4e4e8ce720c SHA-1: 751226e67ca6b445d24247999e270ca150e9a789 SHA-256: bf4148f00908c1178c8fc756f9560cdf59383d4ff1be4bddf6c6c9d078fee974
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a mass of external links, with one prominent link pointing to 'https://jacksth.ru/wix?keyword=the+student+budget+worksheet+answers', suggesting a phishing or SEO spam campaign. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent.

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://jacksth.ru/wix?keyword=the+student+budget+worksheet+answers PDF link annotation
    • http://lezigovedavide.getenjoyment.net/84702259411.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/6977481.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/cbe55f91.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/0794a979847.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/raxaweje_kazix_lunel_simikebemoje.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/40860054098.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/9e157d102543.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/26485434835.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/9739764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nabifovu/mannitol_salt_agar_test.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/xepaxekonoma.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/18479392797.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/71339908688.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/banduras_social_learning_theory_quizlet.pdfIn PDF document text
    • http://retesatitogeli.epizy.com/bike_rider_games.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/titus_andronicus_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/periodic_table_sat_chemistry.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5132 bytes
SHA-256: 6d8b4f1d94d942e6ea32a8a96a2684de9c37bbe0426359a8b8470c3da9a8943c
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10072 bytes
SHA-256: 393af65858865be0ddaf1000c31b74c2a2117dd2eace97ebe7142ef502bd6ec2
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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