Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbe2c1e3158c073…

MALICIOUS

PDF

92.6 KB Created: 2021-02-22 23:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3a7c64537ac6988913825f58cf210b55 SHA-1: 43e6c0c19f5cd43c7bbae20f0ee7f4400c64b720 SHA-256: 7dbe2c1e3158c07373590149c0da22121e1adf3a8c24e59f0fdfcfd4e013c599
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=geronimo%20stilton%20season%203%20episode%202 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455180/normal_6028264cbeeb9.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/megokigopevitipoduji.pdfIn PDF document text
    • http://olx-delivery.cc/23641373030wj4k0.pdfIn PDF document text
    • http://creditscorehelp.info/easy_piano_chords_songs9k9lx.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/loranoduzuja/ap_government_spandana_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/elkonin_boxes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/41085435199.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/40324460530.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/denomifakiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/mandla_madhya_pradesh_weather_report_14_days.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/allianz_reimbursement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/uniform_acceleration_worksheet_4_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/72199962504.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/57500346899.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/cara_bookmark_online.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_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 7860 bytes
SHA-256: 64560b2280eb1bc72d073445ffbceac134ca6eb19c8b0841159e31c5852251d5
font_01_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 5432 bytes
SHA-256: 2d303ede71c73a88a2447e967cc92f92d2f2df3f3b2405efbb39cd8a23c9829f
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 11160 bytes
SHA-256: 990d24a47a0695f3eac8d27df48e4e5dd9a3a95666c23803339f580776a4a409

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