Malicious PDF — malware analysis report

Static analysis result for SHA-256 97263628d837909c…

MALICIOUS

PDF

84.0 KB Created: 2021-05-23 09:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ad75804444bbb3e236c060a40ecbb1b0 SHA-1: 5545aa4a8bb3d1541116b737bc3e7b8eb7d434ed SHA-256: 97263628d837909cf6896d3e92b66e4ae475515d9fce745cd334a128d346b5c4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting an attempt to manipulate search engine results or direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=tapered+roller+bearing+number+and+size+chart+pdf PDF link annotation
    • https://tulizeboposun.weebly.com/uploads/1/3/2/3/132303370/bebobena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_602eaece703ba.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/nalubov.pdfIn PDF document text
    • https://xibulifi.weebly.com/uploads/1/3/4/5/134509251/d2095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_6055251b72619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_604750fcea9b4.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/6992501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_6065f4509c8b6.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/fajafawesov-mejugoxepavosit.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/tikofaketonub/estudio_de_factibilidad_ambiental_proyecto.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/notefull_complete_toefl_mastery_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/intellij_html_formatter_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/luciferase_reporter_gene_assay_in_mammalian_cells.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/ifrs_off_balance_sheet_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/view_search_history_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/kitufeginokusibe.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/rust_vs_c_performance_benchmark.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/chitra_kannada_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/pizusokopavutujajigekunit.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/goditosuxowa.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/kedujafipux.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/manuale_termostato_bticino_l4448.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 3320 bytes
SHA-256: f505ecf3fbbcaf6d783dacf3ec36e77427686cbbf2a9f53316e08e45dbd9bded
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 5708 bytes
SHA-256: 9376526ed6fdfa5403e613934ac51fc2b4fb3b587d34a4fc83ac2317e89c4f89
font_02_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 10672 bytes
SHA-256: 8cdb2a3d37762d3f272b3d74865dab7f3eb4e5991e6a9067ee136e091bfca3b4
font_03_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16260 bytes
SHA-256: b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c

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