Malicious PDF — malware analysis report

Static analysis result for SHA-256 a688021f41494cce…

MALICIOUS

PDF

104.0 KB Created: 2021-03-14 01:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d1b257c428e721e07f8ea6880ac893c1 SHA-1: 7a3f523b553e5ad9d184e929fbce06bcdddd535c SHA-256: a688021f41494cce3d240e91f23f6070fb051c6300e1ff9c78b73326d0269d3b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to artificially inflate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

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://dugedepap.ru/award?keyword=cranial+nerves+and+their+functions+pdf PDF link annotation
    • https://cdn.sqhk.co/badaxiloru/ligcgiD/wujodivemiromaberaduwimaz.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/5gjijgd/luwusovekare.pdfIn PDF document text
    • http://lg-supportteam.com/77880565358291we.pdfIn PDF document text
    • http://prizinsta24.site/fexipul57pt.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/FjcicuW/5951834470.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/92a5036ea25.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/e205e1b3e3f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/aJJihWw/full_house_electrical_installation.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/varolexexus/what_is_mathematical_philosophy_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/xujalogejorar.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/ardaas_karan_full_movie_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/lovumituju.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_d97908e7fa694967ad0d0d492002ccf6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/97436082400.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/what_does_no_codes_stored_in_module_mean.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_05d2acf661f14dbd81691b86b734c956.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/football_picks_week_2_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/motepiwufifitibunegifa.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_off00015c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C41 5208 bytes
SHA-256: 961e963c2c06d391e0fa8526cf615f1548414e31578e6a0dde6a404b3093a7c5
font_01_sfnt_off00016df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF8 10552 bytes
SHA-256: 7b9cf408b07c42e9c534030f3fe5f7edd90fb122123910331471f7700235c5aa

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