Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b58402f9e2c78a…

MALICIOUS

PDF

69.3 KB Created: 2021-02-20 06:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0a24b9349e28d0123b97528807636461 SHA-1: f87549c7dd87d3f37459fb0cd54f4ec7a0d8b43a SHA-256: c5b58402f9e2c78abf40e84f6bac3ce9e364c7b4e5ea49d1a5e9a209a9bd1a58
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/123?utm_term=what+should+be+included+in+a+personal+development+plan PDF link annotation
    • https://navubepoma.weebly.com/uploads/1/3/5/3/135394012/xarifaxejoxupato.pdfIn PDF document text
    • http://reduslimitaly-official.website/dazowajoniduzesudoeaa1n.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/adf060ce53e.pdfIn PDF document text
    • http://ekzo-fruit.ru/vegetarian_keto_diet_plan_for_weight_loss_india2qni2.pdfIn PDF document text
    • http://fringigejy.site/buffer_meaning_in_marathijssdr.pdfIn PDF document text
    • http://ogranicbio.fun/52020538449gdvly.pdfIn PDF document text
    • http://perevod-card2card24.site/calories_in_bubble_tea_with_popping_bubblessu31h.pdfIn PDF document text
    • http://item-get.top/head_first_php_and_mysql9yb31.pdfIn PDF document text
    • http://igbusinessabouthelp.com/learning_disability_health_action_plan_templatehhfmt.pdfIn PDF document text
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/cfafa01c49b55d.pdfIn PDF document text
    • http://vienvozvrat.site/barowewafexefonew49m9.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/add8e03e3d601f5.pdfIn PDF document text
    • http://sallely.xyz/colorado_ballot_initiatives_2018_guidectav9.pdfIn PDF document text
    • https://rekizutor.weebly.com/uploads/1/3/0/9/130969391/7841020.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/333198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 5524 bytes
SHA-256: cbee77ef2d03c314f328f0429c274bee7d5acdf13b63fb25bb01a0fd23e45be2
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 9944 bytes
SHA-256: 81802ac50816ac5dc6322020cd70a44d63b56ff382ed4d9170e51c41941b08b6