Malicious PDF — malware analysis report

Static analysis result for SHA-256 51139d4a88b8e632…

MALICIOUS

PDF

80.3 KB Created: 2021-02-21 16:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b16535fcbe163fcd784924f7783f105e SHA-1: eebb9faf941316048785362265e907b7bddc9e77 SHA-256: 51139d4a88b8e63262cb888468b508ef5963e67026be99716bc2cc56f32bbfe2
156 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 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://leonvi.ru/123?utm_term=what+are+complex+sql+queries PDF link annotation
    • https://cdn.sqhk.co/kusasuzona/azjicFA/gacha_club_pictures_edits.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/2514209.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/2949252.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/Hijhihb/blackstone_academy_for_the_magical_arts_sbenny.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/95d3a5ad84.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/SEZQonT/nintendo_switch_story_of_a_gladiator_review.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/zopenave/ceftazidima_vademecum.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/cardistry_touch_uncut_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/35270574459.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/google_drive_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/fogepipa.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/xaketo.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/hidrostatica_ejemplos.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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 5156 bytes
SHA-256: 9c7981718fbd85e4638a5ae76df6d12306208c2397fd846a1b488c4749308ff6
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 15808 bytes
SHA-256: 8012db775f8aa3afb1cafdafa9249591e6086974be468890297c9c0299adb3be
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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